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Joining data from multiple tables

From: SQL Server Reporting Services in Depth

Video: Joining data from multiple tables

So going from the end of the last example, we have some grouping going on here, but it's not as useful as it could be. So if I were to look at the underlying table definition, the issue that we have is when we are looking at the information for any particular product we are getting a name--say, Water Bottle, 30 OZ--but we are also getting this ProductCategoryID. It's just a number, 32. And what we want to do is take it to a separate table, ProductCategory, where we can take that number of 32 and actually get the name of the category, in this case Bottles And Cages.

Joining data from multiple tables

So going from the end of the last example, we have some grouping going on here, but it's not as useful as it could be. So if I were to look at the underlying table definition, the issue that we have is when we are looking at the information for any particular product we are getting a name--say, Water Bottle, 30 OZ--but we are also getting this ProductCategoryID. It's just a number, 32. And what we want to do is take it to a separate table, ProductCategory, where we can take that number of 32 and actually get the name of the category, in this case Bottles And Cages.

Well, the great thing is, as long as there's a proper relationship defined in the database--and there is here--it's very easy for us to focus on what we want, which is the name of the product and the name of the category. And actually, in this case, we can let Report Builder pretty much figure everything else out. So back in Report Builder, I'm going to switch back into Design view. And really what I want to do here is back things a bit and go back to the dataset. So I actually don't need this table anymore.

So I'm going to delete it. Now to make sure I delete it properly, I first click somewhere inside it and then when the gray bars appear, I'm going to select the one at the very top-left corner, which will give me the entire selected table, and then I just delete that. Now what I want to do is redefine the data set. So I'm just going to double-click the data set name to open that back out. We don't need to change anything about the data source, but we do need to change something about the query. I could manually change the select statement, but I'm just going to go back into the Query Designer. It's still showing me my results from the previous time.

I'm just going to hide those by clicking this button over here. And we just want to focus on the information that we are interested in, which really, for us, is the name in the Product table, I don't really care about ProductCategory ID myself, and then from the ProductCategory table, the name of that. Now, Report Builder is actually smart enough to know that if we have two fields called Name it's not going to work very well. There be a conflict there, so it will internally rename them as Product Name and Product Category Name, and it knows that there's a conflict there.

So how is this going to work? If you've written SQL, you know you have to define the join statement yourself, how these two tables are interrelated. But in fact, a lot of that is being done successfully for us. I can test this by clicking Run Query. And what I'm getting here is the Product Name and the actual ProductCategory Name. And as I come down a little bit further, I'm getting different categories with different products. Now, if you're someone is used to writing SQL, you might be thinking, hang on the second; isn't there a bit of a conflict going on here? Well, let's find out.

Because just by selecting those fields, I'm and become up to the top here and click the Edit as Text button, which will show me the actual SQL statement. And what I'll see here is we are selecting the name from the product table as Product Name, and selecting the name from the category table as ProductCategory Name, and it's generated the inner join statement that joins these two tables together. You see, the query designer here will do a great job of detecting foreign keys in your database as long as your actual database has been well defined. And also, if I untoggle this Edit as Text button, what we want to make sure is that this Auto Detect button in the Relationship section is highlighted, meaning it's selected.

It's trying to detect the foreign keys, and it will do really good job of that. If the relationships you trying to describe in your query are not actually defined in the database, or there's something non-standard, you will have to write the joins yourself. So I'm going to click OK and let's say that is our dataset. And now I want another table, so over to the Insert tab and down to Table Wizard, we'll choose that data set, click Next. Product Name is what our Value is, and ProductCategory Name is what we want to group by.

Click Next. And it doesn't really matter which option we chose here. I'm just going to leave the default, click Next again, and I'll select Generic so we don't have any colors or fonts to worry about, and Finish, and just drag this a little wider. Then up on the Home tab, click the Run button and let's check it out. Now we actually have the name of the category, so under Chains we see the one Chain entry. Under Caps we see the AWC Logo Cap entry. So it's already become a lot more readable, a lot more meaningful, and there's a few missing pieces to it.

So next, let's see how to manipulate the visual layout of this table.

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This video is part of

Image for SQL Server Reporting Services in Depth
SQL Server Reporting Services in Depth

40 video lessons · 9811 viewers

Simon Allardice
Author

 
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  1. 12m 6s
    1. Welcome
      1m 9s
    2. What you need to know
      1m 36s
    3. Exploring SQL Server Reporting Services components
      4m 17s
    4. Reviewing SQL Server versions
      5m 4s
  2. 49m 41s
    1. The elements of a report
      3m 10s
    2. Creating a report with Report Builder
      12m 11s
    3. Grouping table regions on a report
      6m 1s
    4. Joining data from multiple tables
      4m 33s
    5. Formatting report elements
      4m 34s
    6. Using functions in a report
      11m 0s
    7. Displaying data in a matrix
      8m 12s
  3. 24m 9s
    1. Filtering data and adding parameters to a report
      5m 35s
    2. Customizing report parameters
      5m 4s
    3. Sorting data in a data region
      4m 7s
    4. Applying interactive sorting
      4m 57s
    5. Creating a drillthrough action to connect reports
      4m 26s
  4. 49m 57s
    1. Introduction to charting in Reporting Services
      4m 16s
    2. Creating a column chart
      8m 35s
    3. Adding a generated average to a chart
      4m 5s
    4. Creating a pie chart
      8m 19s
    5. Using sparklines
      6m 38s
    6. Adding a sparkline to a drilldown matrix
      14m 34s
    7. Adding data bars
      3m 30s
  5. 21m 48s
    1. Adding indicators to a report
      7m 52s
    2. Using and configuring gauges
      5m 30s
    3. Using maps in Reporting Services
      8m 26s
  6. 38m 14s
    1. Creating modular reports with report parts
      4m 36s
    2. Adding and updating report parts
      4m 37s
    3. Using subreports and nested regions
      4m 28s
    4. Configuring headers and footers
      3m 9s
    5. Printing and exporting reports
      3m 45s
    6. Using page breaks
      5m 37s
    7. Creating and using shared data sources
      8m 11s
    8. Creating and using shared data sets
      3m 51s
  7. 27m 20s
    1. Organizing reports in Report Manager
      3m 1s
    2. Adding users and configuring report security
      5m 24s
    3. Configuring subscriptions
      5m 13s
    4. Creating a linked report
      4m 8s
    5. Using Report Designer in SQL Server Data Tools
      9m 34s
  8. 1m 2s
    1. Goodbye
      1m 2s

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