4: Transact-SQL in Visual Studio .NET

Create QR Code in Visual Studio .NET 4: Transact-SQL

4: Transact-SQL
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TIP Alias: one word two meanings We ve learned that aliases are used in the column list to give us a different header in the output We can also use aliases in the SELECT list to avoid having to type out the name of the tables each time Let s take a look at the query we created in the View Designer:
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SELECT PersonContactLastName AS [Last Name], PersonContactFirstName AS [First Name], SalesSalesOrderHeaderCustomerID [Customer Number], SalesSalesOrderHeaderTotalDue [Order Total] FROM PersonContact INNER JOIN SalesSalesOrderHeader ON PersonContactContactID = SalesSalesOrderHeaderContactID INNER JOIN SalesSalesPerson ON SalesSalesOrderHeaderSalesPersonID = SalesSalesPersonSalesPersonID
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In the next script, we use aliases for the table names Aliases are used for three tables, as shown in Table 4-5 The alias names are at your discretion Using the first character in the table, or the first characters in the schema and the table, is common
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PersonContact SalesSalesOrderheader SalesSalesPerson Table 4-5 Table Aliases
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SELECT pcLastName AS [Last Name], pcFirstName AS [First Name], sohCustomerID [Customer Number], sohTotalDue [Order Total] FROM PersonContact AS pc INNER JOIN SalesSalesOrderHeader soh ON pcContactID = sohContactID INNER JOIN SalesSalesPerson sp ON sohSalesPersonID = spSalesPersonID
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NOTE Students in the classroom often ask me: How do I know what pc represents in the first line You must scan ahead to the FROM clause, looking for the initials of the alias such as pc or soh I realize it s not natural; we d expect to see the definition of pc before we see the abbreviation The only thing I can say is that it gets easier with practice When using aliases in the column list, you can use the letters AS or leave them out The same rule applies when using aliases to identify tables
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A Warning with Column Aliases While we covered column aliases earlier, it s worthwhile to point out a potential problem First, let s remind ourselves what we mean by column aliases by looking at the following script:
SELECT SalesOrderID AS Invoice, TotalDue [TotalDue], OrderDate [Invoice Date] FROM SalesSalesOrderHeader ORDER BY OrderDate
This works fine as written, but when we start creating more complex SELECT statements with embedded functions, we can get unexpected results if we re not careful Notice that the TotalDue column in the SELECT list is being referenced with an alias of the same name of TotalDue This is not good form and can create problems The rule to remember is that the alias needs to be a separate name from any existing column While this seems obvious, let s look at an example using the CONVERT function The CONVERT function allows us to convert data types from one form to another, and it s frequently used to change a date from a datetime data type to a varchar data type so that we can change the way it s displayed For example, the following script will cause the date to be displayed as yyyy-mm-dd hh:m:ss:ms
SELECT GetDate()
Output: 2007-01-17 08:11:49327 Using the CONVERT function, we can have the date displayed in the US format (style 101) as mm/dd/yyyy or in the ANSI format of yymmdd (style 102):
SELECT CONVERT(varchar,GetDate(),101)
Output: 01/17/2007
SELECT CONVERT(varchar,GetDate(),102)
Output: 20070117 Functions can be embedded into SELECT statements Using the CONVERT function within a SELECT statement may look like the following:
SELECT SalesOrderID AS Invoice, TotalDue [Invoice Total], CONVERT(varchar,OrderDate, 101) FROM SalesSalesOrderHeader ORDER BY OrderDate
However, if you run this, you ll notice that the OrderDate column header is blank It makes sense to provide an alias Careful, though The following script gives unexpected results because we are using the same alias name as a column name:
SELECT SalesOrderID AS Invoice, TotalDue [Invoice Total], CONVERT(varchar,OrderDate, 101) As OrderDate FROM SalesSalesOrderHeader ORDER BY OrderDate
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