Types of Joins in Visual Studio .NET

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Table 4-3 Types of Joins
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Inner Joins
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First we ll look at a simple query that joins two tables The ProductionProduct table holds details on the ProductID such as the product name, product number, and ModelID The ProductionProductModel table holds details on the ModelID such as the Model Name If we want a listing of products including the Model Name, we have to join the two tables The following script first shows us what is in both tables, but without using the existing relationship In reality, without connecting the two tables, the two result sets aren t very useful
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SELECT Name, ProductNumber, ProductModelID FROM ProductionProduct SELECT ProductModelID,Name FROM ProductionProductModel
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The two tables are joined on the ProductModelID This is the PK in the ProductModel table and is an FK in the Product table To join the two tables in a SELECT statement, we could use this script:
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SELECT ProductionProductName, ProductionProductProductNumber, ProductionProductModelName AS 'Model Name'
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FROM ProductionProductModel INNER JOIN ProductionProduct ON ProductionProductModelProductModelID = ProductionProductProductModelID
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TIP INNER JOIN is frequently shortened to just JOIN You will see the two syntax choices used interchangeably, but most often, you ll just see JOIN
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A partial output of the previous script is shown in Figure 4-5
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Figure 4-5 Joining two tables
You can see that the JOIN statement identifies the first table (ProductionProduct) and the second table (ProductionProductModel) In addition, it identifies the PK and FK that will be used to join the tables in the ON clause (ProductModelID in each table) We don t have to include the PK or FK in our select list Often, this is meaningless data to end users Instead, we just include what we want in the output Notice I used an alias in the select list for the Model Name This is because we have two columns named Name, one in each table To differientiate between the two in the output, I used an alias of 'Model Name' for the second Since it has a space, I delimited it with single quotes Let s take a query that we used earlier to pull the top five sales out of the database While it lists the CustomerID and SalesPersonID, you will very likely be requested to add actual names The following query shows where we start:
SELECT TOP 5 CustomerID, SalesPersonID, TotalDue FROM SalesSalesOrderHeader ORDER BY TotalDue DESC
4: Transact-SQL Primer
Next we ll modify the query to pull the data and also list the actual salesperson names To help conceptualize the tables that are joined, let s look at the database diagram that shows the tables that hold the data that we want Figure 4-6 shows the relationships among the three tables Notice that in the diagram, the schema is shown in parentheses
Figure 4-6 Database diagram of Sales SalesOrderHeader, SalesSalesPerson and Person Contact tables,
NOTE Notice in the diagram that the object and schema names are swapped from how they would appear in the four-part naming convention For example, in the diagram the Contact table is listed as Contact(Person), but using the four part name it would be listed as ServerAdventureWorksPersonContact, or shortened to PersonContact If you ve used Microsoft Access, you may have used the Query By Example (QBE) window SQL Server has a similar tool called the View Designer in SSMS that is used to create views We used it in 2, and we ll use it again here to show how to easily build our SELECT statement joining multiple tables In the following exercise, we ll use the View Designer to create a listing of customers who have ordered products including how much the orders were
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Exercise 45: Using the View Designer to Create Complex Joins 1 Open SSMS and open the AdventureWorks database by double-clicking Databases and double-clicking the AdventureWorks database 2 Right-click Views and select New View 3 In the Add Table dialog box, select the Contact(Person) table and click Add Select the SalesOrderHeader(Sales) table and click Add Click Close 4 Arrange the tables so they look similar to Figure 4-7 Notice that the relationship is shown and points to the ContactID column in both tables
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