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table variables can be used in Insert statements except when the Insert statement collects values from a stored procedure:
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Unlike temporary tables, table variables always have a local scope. They can be used only in the batch, stored procedure, or function in which they are declared. The scope of cursors based on table variables is limited to the scope of the variable (the batch, stored procedure, or function in which they are defined). table variables are considered to be nonpersistent objects, and therefore they will not be rolled back after a Rollback Transaction statement.
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If possible, use table variables instead of temporary tables. table variables have less locking overhead and therefore are faster.
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Flow-control statements from T-SQL are rather rudimentary compared to similar commands in other modern programming languages such as Visual Basic and C++. Their use requires knowledge and some skill to overcome their lack of user friendliness. However, on a positive note, they allow the creation of very complex procedures.
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This section covers the use of the following Transact-SQL statements and programming constructs: Comments Statement block If Else While Break Break Continue GoTo WaitFor Begin End
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You can include comments inside the source code of a batch or a stored procedure; these comments are ignored during compilation and execution by SQL Server. It is a common practice to accompany source code with remarks that will help other developers to understand the your intentions. Comments can also be a piece of Transact-SQL source code that you do not want to execute for a particular reason (usually while developing or debugging). Such a process is usually referred to as commenting out the code.
Single-Line Comments
There are two methods to indicate a comment. A complete line or part of the line can be marked as a comment if the user places two hyphens (--) at the beginning. The remainder of the line becomes a comment. The comment ends at the end of the line:
-- This is a comment. Whole line will be ignored.
You can place the comment in the middle of a Transact-SQL statement. The following example comments out the last column:
Select LeaseId, LeaseVendor --, LeaseNumber From Lease Where ContractDate > '1/1/1999'
This type of comment can be nested in another comment defined with the same or a different method:
C h a p t e r 4 : B a s i c Tr a n s a c t - S Q L P r o g r a m m i n g C o n s t r u c t s
-- select * from Equipment - Just for debugging
This commenting method is compatible with the SQL-92 standard.
Multiline Comments: /* */
The second commenting method is native to SQL Server. It is suitable for commenting out blocks of code that can span multiple lines. Such a comment must be divided from the rest of the code with a pair of delimiters (/*) and (*/):
/* This is a comment. All these lines will be ignored. */ /* List all equipment. */ select * from Equipment
Comments do not have a length limit. It is best to write as much as is necessary to adequately document the code. SQL Server documentation forbids the nesting of multiline comments. In different versions and in different tools, the following may or may not generate a syntax error:
/* This is a comment. /* Query Analyzer will understand the following delimiter as the end of the first comment. */ This will generate a syntax error in some cases. */ Select * from Equipment
If you type this code in Query Analyzer, the program will not color the last line of explanation as a comment. (I am not sure you will be able to see a difference on the paper.) However, during the execution in Query Analyzer, the third line of the comment is ignored and will return a result set without reporting a syntax error (see Figure 4-1). Single-line comments can be nested inside multiline comments:
/* -- List all equipment. Select * from Equipment */
In 6, when I discuss batches, I will illustrate the restriction that multiline comments cannot span more than one batch.
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