Combine data from multiple data sources (Power Query) - Excel
Each fact joins to one dimension member; a single dimension By specifying the many-to-many dimensional relationship, you are more likely In SQL Server Data Tools, in a multidimensional project, create a data In this next procedure, you will use Excel to connect to the cube and verify query results. data from multiple tables in SQL Server into the Excel Data Model in Excel using Power Here are the steps to use Power Query to create the relationship automatically: and one of the side-effects of using Table. Technically multiple relationships can be created between tables but only one can be active. There is a DAX function called USERELATIONSHIP() which can use inactive relationships. This is an advanced technique.
Right-click on a selected column header, and click Remove Columns. In the New column name textbox, enter Line Total. Transform an OrderDate year column In this step, you transform the OrderDate column to render the order date year.
Rename the OrderDate column to Year: Right-Click one of the headers, and click Group By. In the Group By dialog box: In the New column name textbox, enter Total Sales.
Relationships between tables in a Data Model - Excel
In the Operation drop-down, select Sum. In the Column drop-down, select Line Total.
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Rename a query Before you import the sales data into Excel, name the query Total Sales: Right-click Cubes and select New Cube. You are choosing FactInternetSales because it contains the measures you want to use in the cube.
You are choosing FactInternetSalesReason because it is the intermediate measure group, providing member association data that relates sales orders to sales reasons. Choose measures for each fact table. To simplify your model, clear all the measures, and then select just Sales Amount and Fact Internet Sales Count at the bottom of the list. The FactInternetSalesReason only has one measure, so it is selected for you automatically. You do not need this dimension, so you can clear it from the list.
Name the cube and click Finish. Recall that the following icon indicates a many-to-many relationship. You can see that this dialog box is used to specify a many-to-many relationship. If you were adding dimensions that had a regular relationship instead, you would use this dialog box to change it to many-to-many. Deploy the project to an Analysis Services multidimensional instance. In the next step, you will browse the cube in Excel to verify its behaviors.
Testing Many-to-Many When you define a many-to-many relationship in a cube, testing is imperative to ensure queries return expected results.
Relationships between tables in a Data Model
You should test the cube using the client application tool that will be used by end-users. In this next procedure, you will use Excel to connect to the cube and verify query results. Browse the cube in Excel Deploy the project and then browse the cube to confirm the aggregations are valid. Enter the name of the server, choose the database and cube.
Create a PivotTable that uses the following: Because we are using sample data, the initial impression is that all sales orders have identical values. However, if you scroll down, you begin to see data variation. Part way down, you can find the sales amount and sales reasons for order number SO Grand total of this particular order is Notice that the Sales Amount is correctly calculated for the order; it is Why put a sales amount under each sales reason in the first place? The answer is that it allows us to identify the amount of sales we can attribute to each reason.
Scroll to the bottom of the worksheet. It is now easy to see that Price is the most important reason for customer purchases, relative to other reasons as well as the grand total.
Tips for handling unexpected query results Hide measures in the intermediate measure group, such as the count, that do not return meaningful results in a query. Next, in the Power Query tab in the Excel ribbon, click the Merge button. In the Merge dialog select Dimension as the first table, Fact as the second, and in both select the FruitID column to join on. Click OK and the Query Editor window opens again.
Open the Power Pivot window and you will see that not only have your two tables been loaded into the Data Model, but a relationship has been created between the two: What are the problems I talked about then? Secondly if you delete the two tables from the Data Model and delete the two Power Query queries, and then follow these steps again, you will find the relationship is not created. Could Power Query and M one day be the modelling language that Marco asks for here?