Tableau cross database join limitations. These can be in the same data source (such as tables in a database or sheets in an Excel spreadsheet) or different data sources (this is known as a cross-database join). Tableau cross database join limitations

 
 These can be in the same data source (such as tables in a database or sheets in an Excel spreadsheet) or different data sources (this is known as a cross-database join)Tableau cross database join limitations  I tried doing this by 2 methods : Data Blend: Tableau Public

The new Tableau cross database join functionality enables: Rapid prototyping. 5 or later to make use of the inequalities in join clauses in cross-database joins feature. Whenever I do the join with works just fine, I publish it as a datasource. Salesforce also supports combining tables from different databases using a cross-database join. Moves to Site Settings on multi-site servers. Cross-Database Joins: Determines where the join process happens when joining data from multiple sources. Relationships defer joins to the time and context of analysis. 2) Performance can be slow with Cross DB joins, depending on volumes of data, CPU resources, etc. A functional role hierarchy contains only users or other functional roles, while access roles contain only privileges. Make sure the correct cardinality is set in the Performance Options of the relationship. Cross-Database Join – Uncover insight through multiple datasets. Cross-database joins requires setting up data sources from multiple connections. Join culling is a term for how Tableau simplifies queries by removing unnecessary joins. Give it a try and circle back if you need further help. For example, cross-database joins with visual design support mean that analysts can combine data sets in Tableau’s internal store without doing a lot of database work ahead of time or asking a. Enter a new name for the Union table. There is no performance penalty. Cross-database joins require a multi-connection data source—you create a new connection to each. The functionality implemented in tableau 10 was 'cross database join' which allows us to cross data between different sources easily which is similar to blending. There is no option of scheduling in Tableau. Loading. Data Blending can be. Just be mindful of this risk of data duplication and have an established governance framework for how you control multiple data sources having essentially the same data (but slightly different) and how people would find what they are. Note: Not all data sources support cross-database affixes, including. Instead, we need to publish the two data sources. 3. Method 2: Export Data from Tableau Views. Relationships defer joins to the time and context of analysis. Before giving any solution, its important to know the source of the data. Tableau allows joins from tables in different data sources, albeit with some limitations from the database side on which platforms are compatible. Tableau does not support cross-database unions, but it does support cross-database joins for nearly all data sources, which we leveraged to build a union. Data sources that join data from. Asked by: Cora Bartell. This is kind of like artificially creating a field in both tables and making all the values 1. Because Tableau handles combining the data after the data is aggregated, there is less data to combine. Not doing so means the difference between your Tableau viz rendering in seconds vs. You cannot drag the table from the left pane to the canvas as you normally would when creating a cross-database join. Anything like a cross database filter or a join is going to be run every time Tableau refreshes the data and given 8M customers and probably a much larger version of orders that means that Tableau has to get a distinct list of the customers from the orders table and then join that into the customers, so having some performance issues is not too. On: July 7, 2022. xlsx” and Tableau directly creates a Cross Database Default Inner Join. Cross-Database Joins. Using data source filters will limit Tableau's ability to do join culling in the data. For a list of connection class strings, see “Class Strings”, in Additional Information below. When related data is stored in tables across different databases or files, you can use a cross-database join to combine the tables. For text or Excel-based data, modify the data type of one of the text or Excel fields in the join key using the data type menu in the data grid. The same applies when using Tableau. ID should be looked up and if there is any nulls then it should take the Emailid. It also explores the components of Tableau Server. I have 2 datasources 1)oracle 2)snowflake . 2, before relationships), it was possible to count the number of records in the data source by creating a calculation with the constant value 1 and summing it. If you notice duplicate data, instead of creating a join, use data blending to blend on a common dimension instead. Cross-Database Joins: Tableau allows joins from tables in different data sources despite limitations from the database side on which platforms are compatible. 3. If you know how to join tables within the same database, that's great! Cross-database joins only take a few more steps to. I am currently working with 2 databases, 1 MS SQL and 1 Oracle. Hi, Create a cross database join by adding a new mysql connection that points to your second database, and then use the Tableau UI to create the right join. It could be a collection of Excel files that you've combined together using joins or cross-database joins or unions. Data Blending Limitations in Tableau. You can see aggregations at the level of detail of the fields in your viz. Enter the information. Expand the functionality that allows cross database joins to also allow unions within a single data source. The following illustrates syntax of the CROSS JOIN clause: SELECT column_list FROM A CROSS JOIN B; Code language: SQL (Structured Query Language) (sql) The following picture illustrates the result of the cross join between the table A and table B. ×Sorry to interrupt. Stylish the Cross-Database Join conversation, select one out the following options, then click DONE: Use Tableau or existing databases. However, a . This video introduces cross-database joins that will allow the merging of data from two separate data sources. Provided you combinated tables using a cross-database join, Tableau standard the tables in the canvas and the columns into the data grid to show you which connection the. However, there are instances where data blending does not perform effectively and data from different sources are brought into. tableau. If the connection is unsuccessful, verify that the authentication information is correct. 1 introduced one really nice feature (Cross-database join improvements). However, you may try below approaches • If you're using excel then you can use pivot option with "legacy. This step creates the first connection in the Tableau data source. Implementing Tableau Data Blending with an Example: Step1: Connect to your data and set up the data sources and designate a primary data source. 1. However, there are instances where data blending does not perform effectively and data from different sources are brought into. When you cannot use cross-database joins in some specific database that do not support it, like Oracle Essbase, Google Analytics (an extract only connection), etc. Cross-database joins do not support connections to cubes (for example, Oracle Essbase) or to some extract-only connections (for example, Salesforce). Now, however, that calculation would have a value. Loading. Tableau Data Blending And Cross Join . On the data source page, double-click New Union to set up the union. Tableau's Ask Data and Metrics features will be retired in Tableau Cloud in February 2024 and in Tableau Server version 2024. However, you could create a local TDE that is a product of a cross database join. ”. Not every database supports cross database joins, however. Cross database join is a new feature in Tableau. The example below is an oracle connection object. Before giving any solution, its important to know the source of the data. In Tableau Desktop: On the Start page, under Connect, connect to a supported file type or supported database type. For more information, see Let Site Users Request Access to Content (Link opens in a new window) in Tableau Cloud Help. 2. Use extracts for file-based data: In general it’s best practice to import file-based data—text files such as CSV, Microsoft Excel spreadsheets, and Microsoft Access files, as well as statistical files like SPSS, SAS, and R—into Tableau. You combine data between tables at the physical layer using joins. In Tableau Desktop, select Worksheet > Export > Data. When a Salesforce connection is included in a multi-connection data source, the data source won't. What are Joins in Tableau? If you have been working with SQL before, you might be familiar with the main joins concepts: left, right, inner, cross, and full outer joins. Tableau is adaptable to the extent that performing different procedure on information is concerned. 4. Join culling is a term for how Tableau simplifies queries by removing unnecessary joins. It doesn't duplicate the rows and working fine with one to many relationship. What does a Tableau join do? Combines data from two tables by bringing in new columns based on a shared field or fields. There is no option of scheduling in Tableau. The data-blending feature in Tableau is particularly useful in the following cases: When you are not able to use cross-database joins in some specific database that does not support it, such as, Oracle Essbase, Google Analytics (an extract only connection), you can import or connect to separate data in such case sources and then combine them. If both the tables coming from the same data source then you can go for Joining or Union otherwise Blending or Cross-Database Join. Cross-database joins do not support connections to cubes (for example, Oracle Essbase) or to some extract-only connections (for example,. Not doing so means the difference between your Tableau viz rendering in seconds vs. Data as Left and Security as Right. A blend aggregates and then combines the data. Typically joins are recommended for combining data from the same database. Tableau v2023. CSS ErrorDashboard extensions give you the ability to interact with data from third-party applications directly in Tableau. Or, Try one of the following workarounds: Use Legacy Connection for both files; Use Standard Connection for both files; Cause This behavior is related to a known issue (ID: 733366) which is fixed in more recent versions of Tableau Desktop. Clearly the 3 tools support all types of data, however, due to in-built data virtualization, Knowi does bring something extra and unique on the. Where can i find the details or pros and cons of tableau extracts and live connection? Something like. Create a cross-database join if your tables are in different data sources. Join Your Data - Tableau. During analysis, Tableau adjusts join types intelligently and preserves the native level of detail in your data. To create a join, you need to double click on the table in the logical/relationship layer and add another table next to it. Data blending is useful under the following conditions: You want to combine data from different databases that are not supported by cross-database joins. In the Tables dialog box, click Add New Table. That’s because they aren’t supported for cross-database joins yet. Following are steps that you can carry out to perform a Data Joining in Tableau: Step 1: Connection with a Database. To manage memory resources on the machine, the maximum memory limit for Data Engine is set by Tableau Server Resource Manager. Metabase’s query builder is quite basic, and users will often need to fall back to writing SQL to get the answer they need. For your second screenshot, yes, it looks like Tableau is getting hung up on nuances like integer vs. 1 Resolution. Regards, tgvr. Cross-database joins require a multi-connection data. You can use relationships to create multi-fact data models. This makes queries perform much faster and also results in a much smaller file to store the data values. Cross-database joins- Using OR condition Hi, Can anyone help me with a requirement where, i have to connect to two data bases (HANA and SSMS) where the join is based on HANA. They both contain the dimension State. 0 between these two databases . I have many other extract refreshes scheduled on tableau bridge which are also cross-database joins mainly of two types i. To explain creating joins in Tableau to you, we select three data tables; Orders, Managers, and Returns. Cross-database join limitations with Salesforce. When using a data source filter it seems that tableau calculates the join first, and then applies the data source filter. This makes queries perform much faster and also results in a much smaller file to store the data values. That might still be a limitation. Loading. Cross-database joins do not support connections to cubes (for. Advertisement. Click “connect to Salesforce” to launch Tableau’s Salesforce connector (Image credit: Salesforce) Once you have enabled the correct APIs, launch Tableau. com Back on the data tab, click the “add” link to add other connections to this data source. The steps in an ordinary join would follow the process below: 1. SivaStart out by dragging Customers and Dates to the data pane. You can use relationships to create multi-fact data models. Enable the performance option for cross-database joins. The Process of Cross-Database Joins in Tableau -. 9Character Count. Tableau’s new default way is the data relationships which makes things a lot easier for the novice. When a Salesforce connection is included in a multi-connection data source, the data source won't. Use a blend when: You want to combine measures or dimensions with the same meaning but different names in each table. If you're on Windows, the Export Data to Access dialog box displays to give you. For example, joins can be established. After connecting to your data, double-click the New Custom SQL option on the Data Source page. You can explore more join options available in Tableau and join your data tables as per your requirements. A Join combines the data and then aggregates. Relationships defer joins to the time and context of analysis. The limitations of data blending are: Data blending may result in some missing data from the secondary data source. Relationships defer joins to the time and context of analysis. Tableau does not support cross-database unions, but it does support cross-database joins for nearly all data sources, which we leveraged to build a union. data sources stored on Tableau server cannot be joined with other data sources in Tableau Desktop. decimal numbers. To create a cross-database join, you create a multi-connection Tableau data source by adding and then connecting to each of the different databases (including Excel and text files) before you join the tables. 1 was assigned to each row in the data source so the sum was equal to the number of rows. If the data type is changed after the join, the join will break. When a relationship is created between tables, the tables remain separate (normalized), maintaining their native level of detail and domains. Cross-database joins require a multi-connection data source—that is, you create a new connection to each database before you join the tables. Hi All. From what I can tell, this causes Tableau to truncate the date (though for join purposes it still sees it as Date & Time). EMail. ×Sorry to interrupt. 2, support cross-data based joins on calculations in most cases. Tip: Not all data roots support cross-database joins, with published Tableau file quelltext. The Cross-database join option changes from the default option, Using Tableau (using Hyper), to the new option Using your database, depending on what you choose. The union that we’re doing is actually a form of cross join (aka cartesian join or cartesian product, see Alexander Mou’s post for some background) that uses Tableau’s cross data source join and the new join calculations in Tableau v10. To create calculations, you need to understand the operators supported by Tableau. The related join () method, uses merge internally for the index-on-index (by default) and column (s)-on-index join. 2. For more information, see Let Site Users Request Access to Content (Link opens in a new window) in Tableau Cloud Help. You can then do a cross-join to this data set. ×Sorry to interrupt. The Solution: Using cross-database join to build a union. Double-click a logical table to open the physical layer and add joined tables. 3) Validate that you can get a cross database join to work from the ServiceNow data. Under Data Source, select Order Date. Join culling is a term for how Tableau simplifies queries by removing unnecessary joins. To union tables manually. Drag the Sales Plan measure to the Level of Detail shelf. It made me happy. Well , my file is a . For more information, see the "Combine tables from different databases" section in Join Your Data. There are different tables and joins available there. The ability to query many disparate datasource in the same system with the same SQL greatly simplifies analytics that require understanding the large picture of all your data. You can see aggregations at the level of detail of the fields in your viz. 3. Duplicate data after a join is a symptom of data at different levels of detail. Drag a table from the left pane to the Union dialog box. Cross Join: Cross join produces rows which combine each row from the first table with each row from the second table. Cause This is a known issue that is being addressed by Tableau development team. xlsx ’. Loading. When finished, click OK. This new optimizer avoids unnecessarily moving large datasets by executing cross-database joins locally in the database containing the larger of the two datasets being joined. In this illustration, the table A has three rows 1, 2 and 3 and the table B also has three rows x. A new technique termed Data Blending in Tableau allows you to combine big data. The union that we’re doing is actually a form of cross join (aka cartesian join or cartesian product, see Alexander Mou’s post for some background) that uses Tableau’s cross data source join and the new join calculations in Tableau v10. Switch between data connections in the Left pane, then drag out the desired table to the canvas and release it. Blending happens after aggregation and performance can be fast/slow depending on a number of factors as well -- but typically, extracts are recommended if using a cross DB join so the query speeds will stay as fast as can be. take the max of Sales by Country and the sum of Sales Quota by Country. Cross database join in general are supported - it is the data source that is the limiting factor - in this case Cubes sources limit what can be done as well as some other. In Connect to Data > On This Site > Content Type dropdown menu, select Virtual Connections. Limitations Of Data Blending In Tableau. We use three kinds of cookies on our websites: required, functional, and advertising. Here’s how it works:Important: This feature temporarily moves data outside of Tableau. Have you checked here: Join Your Data. Introduction. Environment. @Budi Lubis (Member) Thanks for the inputs, I have tried extracting cache DB tables connection first later I have introduced excel connection and made joins between one of. g. For quite some time, one of Tableau’s strengths has been its ability to join multiple data sources. Steps to Implement Data Joining in Tableau. 4 (unable to upgrade due to IT restrictions) Data Connection: Excel File (Legacy Connection) - data is inside an Excel Table linked to a SharePoint list Paging null as he must know the Jet SQL 'LIKE' syntax pretty well by now . Be sure that the database you are connected to is from a trusted source. Type or paste the query into the text box. Trick: Simplify the formula by counting a non-null fieldThanks to cross database joins (not to be confused with cross joins), we can use this technique between databases. Observe: Non all data sources support cross-database joins, involving released Tableau data sources. Do a cross database join using a text field from your ServiceNow data to an Excel file with known values in each, e. The book details the role that Tableau Prep Builder and Tableau Desktop each play in data modeling. When you click OK, the query runs and the custom SQL query table appears in the logical layer of the canvas. If you're trying to build an enterprise grade view for millions of rows, Tableau isn't meant for that. When a Salesforce connection is included in a multi-connection data source, the data source won't. limit. The cross database join is meant to make things easier on analysts if they're trying to join subsets of data and have no other tool to do so. ×Sorry to interrupt. Here sheet 1 is an excel sheet with 3 values. Does any one have a recommendation for a solution? Basically the secondary datasource (Excel File) has a [Name] field and the primary data source (Microsoft SQL Server) has a field that has the. You have lots of data. It also creates a flexible environment where users can perform cross-database joins, even joining data from a structured database like MySQL with that of an unstructured database like MongoDB. That’s because they aren’t supported for cross-database joins yet. Name the calculated field. In table area, double click on REGIONS to use this entity. CSS Error Cross-database joins. 2 version. Tableau said you can union multiple data sources, but we all felt we were fooled. The primary and secondary data sources must to be distinct and derive from several databases. Tableau Desktop cannot join published data sources, most extract-only data sources, or cube data sources. Additional Information For additional information on the new feature, see "Cross-database joins for Snowflake" from the Tableau 2023. 5. To combine published data sources, edit the original data sources to natively contain the join or use a data blend. Could you please help me on how to remove those duplicate records. Step 1: Connect to the “Microsoft Excel” file. Common issues. If they combinated tables using a cross-database join, Tableau colors the tables to the canvas or the columns in the data louvers to demonstrate you which connection the evidence comes from. To begin with, select different tables that you would like to join in Tableau. Join culling is a term for how Tableau simplifies queries by removing unnecessary joins. Blending happens after aggregation and performance can be fast/slow. Putting it together to author. CROSS DATABASE JOIN – Joins data sources from different locations/databases e. - Joins cannot be used on published data sources. If the connection continues to fail,. 0 and 10. To limit the parallel queries for a cross-database join: tabadmin set native_api. Diese can be in the same data source (such as tables in ampere databank instead sheets in an Excel spreadsheet) button different data quellen (this is known as a cross-database join). Visualization helps businesses analyze their data in the form of charts and graphs and allows them to make data-driven decisions. Besides, joins have other limitations: Results depend upon the choice of the left table. Status:. You can upload the table using Tableau Prep with the output pointing to your database, or the desired process you want (Ms Access, importing it using sql management studio, etc). For text or Excel-based data, modify the data type of one of the text or Excel fields in the join key using the data type menu in the data grid. But the case here is different. Using data source filters will limit Tableau's ability to do join culling in the data. Important : If you select Use Tableau or existing databases , Tableau chooses the fastest option. So First we connect to the SQL SERVER Express , give the data base name and user credentials and connect to Order table. Cross-database joins require a multi-connection data source—that is, you create a new connection to each database before you join the tables. All three of these tables. Tableau Cloud 2022. Scheduling or notification of reports: Tableau does not provide the feature of automatic refreshing of the reports with the help of scheduling. @peeyush jain (Customer) . Step 1: Connect to your data and set up the data sources. Right and Full outer joins are disabled in Tableau 10 with cross data join. Cross-Database Joins: Tableau allows joins from tables in different data sources despite limitations from the database side on which platforms are compatible. Select another table from the left pane and drag it directly below the first table. I can simply do a full outer using custom sql if both the tables are from same database. Tableau automatically selects join types based on the fields being used in the visualization. Here's the Quickstart on Cross Data Base joins from the Tableau Help: Quick Start: Combine Tables Using Cross-Database Joins . Edited: Yes, there's still a hard limit of 10 UNIONS to one JOIN. Under Data Source, click Add new join clause, and select Ship Date. Cross-database join — allows two or more connections per data source On the Data menu, select a data source, and then select Edit Data Source . tablename) to tell Tableau which db the table is residing on. What is cross database join in Tableau? Cross-Database Join is the new feature that Tableau 10 provides to cross data between different sources much faster and without any additional technical knowledge. Generates SQL in the native dialect of the source databases. “Theoretically, the upper practical limit for the size of an extract is around 1 billion rows or 6 billion tuples. Joins allow us to re-construct our separated database tables back into the relationships that power our applications. , an Excel sheet and a Google sheet. However, Tableau is full of unexpected workarounds as long as you’re willing to get creative with the built-in functionality. Use Tableau or existing databases - Select this option if you want to allow users to choose whether they want to allow Tableau to use the live database to perform cross database joins. 6 (17G65) Expand Post. we can change it to left Join to see all Orders Data. Publish the integrated data source to Tableau Online or Tableau Server to collaborate with others. Tableau's own join (front-end) - this is also known as data blend. The subquery will be more dynamic. When running queries in Athena, keep in mind the following considerations and limitations: Stored procedures – Stored procedures are not supported. Tableau Desktop only: For most connections, you can use the Convert to custom SQL option to change the data type of one of the fields in the join key. . For more information, see the "Combine tables from different databases" section in Join Your Data. connection. If you combined tabular using a cross-database join, Tableau colors the graphics in the canvas and the dividers in of data grid to show you which connection the data comes from. ×Sorry to interrupt. This will enable you to create smart joins or add tables based on those relationships with just one. Tableau allows joins from tables in different data sources, albeit with some limitations from the database side on which platforms are compatible. 3+) so that you can leverage the recommendations engine. April 21, 2020. We can toggle between them. CustID = SSMS. Union Your Data - Tableau. 2. 0. Drag the Easy Pivot sheet into view and drag it to the Pivot Helper as well. . I would like to write custom sql against two different databases, ensuring they have matching columns, and then have them be treated as one data source by tableau. Give it a try and circle back if you need further help. Business Intelligence (BI) Solutions and Services, Big data, Training, Barcelona, Dubai, Abu Dhabi Cross-Database Join with Tableau 10 - ClearPeaks Blog Tableau 10 comes with a great new feature called Cross-Database Join, which allows us to cross data between different sources easily and intuitively. You cannot drag the table from the left pane to the canvas as you normally would when creating a cross-database join. Wenn you combined tabling using a cross-database join, Tableau colors the charts in the big and the columns in the data grid up show you that connection the data happen from. Cross-database Joins. These can be included one same data source (such as tables in a database oder sheets in einem Excellent spreadsheet) or difference data roots (this has recognized the a cross-database join). Tableau v2023. , What does a Tableau union do? Unions cannot be performed in Tableau, only Joins can be used. Tableau allows joins from tables in different data sources, albeit with some limitations from the database side on which platforms are compatible. In the Calculation Editor, type the field name. 2. Our new optimizer avoids unnecessarily moving large datasets by executing cross-database joins locally in the database containing the larger. The second layer is the physical layer of the data source. g. Cross-database joins for combining data. Limitations of joins: - Joins may sometimes produce missing or unmatched data fields. The first table provides the first set of rows/records and the second table provides the second set of rows/records. 1210) 64-bit) on macOS 10. This means you can join tables of data from completely different database and file formats. still getting ready for your cert exam? Cross database join in general are supported - it is the data source that is the limiting factor - in this case Cubes sources limit what can be done as well as some other sources (like google analytics) - using an extract will work with some sources but not cubes -Tableau cross database join. The database connections defined in the workbook or data source determine how you can publish and keep the data fresh on Tableau Cloud. separate connection for each table. Upvote Upvoted Remove Upvote. Limitations of Data Blending in Tableau. There may be multiple reasons why data resides in different databases but that is beyond the scope of this chapter. ,. connection. Is it possible by using a Tableau Online connection? Thank you for your help, Bertrand. 2. Here’s a list of my 10 favorite features. It translates ID's in one database to ID's in another database. A join will show rows for every match. The cross-database join feature has simplified the process of bringing data together for exploration and uncovering new insight. Loading. Step3: Once we go to the worksheet, we can find all the data in a single source. Metabase limitations. Source Name:-----Source1. Expand Post. Aenean sollicitudin, lorem quis bibendum auci elit consequat ipsutis sem nibh id elit dolor sit amet. CROSS DATABASE JOINS In tableau 10 you can join data from disparate data sources like oracle and excel. Joining disparate data sources. When a Salesforce connection is included in a multi-connection data source, the data source won't support the following features: Live connections. Restart the Tableau Server to apply the change. If you use Prep Builder to connect to relational databases, Prep Builder will now automatically detect the relationships in your table. For example, joins can be established between a table in SQL Server and another table in an Oracle database, Excel file or even a flat file. Cross-Database Joins. Tableau is a popular data visualization tool that is used by businesses of all sizes to quickly and easily analyze data. Cross-database joins require a multi-connection data source—that is, you create a new connection to each database before you join the tables. schemaname. ×Sorry to interrupt. Join us as we walk through some of our favorite Tableau hacks in the following blog posts. ×Sorry to interruptSorry to interruptWith joins we can select the way we want to join the data. 4. For more information, see Join Your Data (Link opens in a new window). When you join multiple tables in a data source, Tableau uses functionality that is generally invisible to the user, called join. i. Joins are a traditional method to combine our data based on certain conditions. It allows users to create dashboards and visualizations that can be used to share insights with stakeholders. cross-database joins are quite useful in bringing together…Give this method a try. Then change the Excel date to Date & Time (not Date). Duplicate data after a join is a symptom of data at different levels of detail. This new optimizer avoids unnecessarily moving large datasets by executing cross-database joins locally in the database containing the larger of the two datasets being joined. Cross-database joins are not supported. Create a role per user for cross-database join use cases; Use managed access schema to centralize grant management; Define two types of logical roles: functional roles; access roles . 1 introduced one really nice feature (Cross-database join improvements). And if it's live - they'll both be live. In contrast to a join, data blending requires many, unique sources of data that are mentioned separately. Determines where the join process happens when joining data from multiple sources. 2. I'm not aware of this limitation. Occasionally when working in Tableau, you will have to perform a function called data blending, which involves combining data from different sources. Cross-Database Join: Tableau 10 introduced Cross-Database Join, a new feature that allows you to cross data between different sources much more quickly and without requiring any additional technical knowledge. Some data connection types aren’t allowed to be involved in cross database joins at the moment. Type or paste the query into the text box. To limit the parallel queries for a cross-database join: tabadmin set native_api. data sources stored on Tableau server cannot be joined with other data sources in Tableau Desktop.