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The batch delimiter for T-SQL is GO. While parsing code, when SQL Server encounters a GO, the batch is considered terminated and any subsequent code is considered to be within another batch. Even if the GO is within a comment block, SQL Server still interprets the GO as a batch delimiter.
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SQL Server provides three types of objects that are designed to pass values within your code, as well as return a scalar value to a calling routine.
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Variables provide a way to manipulate, store, and pass data within a stored procedure, as well as between stored procedures and functions. SQL Server has two types of variables: local and global. A local variable is designated by a single at sign (@) while a global variable is designated by a double at sign (@@). In addition, you can create, read, and write local variables, but you can only read the values from global variables. Table 5-1 lists some of the more common global variables.
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Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
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tabLe 5-1 Global Variables
GLObaL vaRiabLe
DeFinitiOn
@@ERROR @@IDENTITY @@ROWCOUNT @@TRANCOUNT @@VERSION
Error code from the last statement executed Value of the last identity value inserted within the connection The number of rows affected by the last statement The number of open transactions within the connection The version of SQL Server
Best PraCtiCes
iDentitieS
The @@IDENTITY variable contains the last identity value inserted for the connection. If you call multiple code modules that insert identity values, the last value inserted is always contained in @@IDENTITY. For example, if you call a procedure that inserts a row into TableA, which has a trigger that inserts rows into TableB, TableC, and TableD, with each insert generating a new identity value, the value of @@IDENTITY that is retrieved following the insert into TableA corresponds to the identity value inserted into TableD. Because of this limitation, the use of @@IDENTITY is very strongly discouraged. Use the SCOPE_IDENTITY() function instead, which returns the last identity value inserted in the scope of the current statement.
You instantiate a variable with the DECLARE clause, where you specify the name and the data type of the variable. A variable can be defined using any data type except text, ntext, and image. For example:
DECLARE @intvariable @datevariable @spatialvar @levelvar INT, DATE, GEOGRAPHY, HIERARCHYID
DECLARE @tablevar (ID Customer INT
TABLE NOT NULL,
VARCHAR(50) NOT NULL)
note
DePRecateD Data tYPeS
Text, ntext, and image data types have been deprecated and should not be used.
While a single DECLARE statement can be used to instantiate multiple variables, the instantiation of a table variable must be in a separate DECLARE statement.
Lesson 1: Stored Procedures
You can assign either a static value or a single value returned from a SELECT statement to a variable. Either a SET or a SELECT can be used to assign a value; however, if you are executing a query to assign a value, you must use a SELECT statement. SELECT is also used to return the value of a variable. In addition to assigning a value using either a SET or SELECT statement, you can also assign a value at the time a variable is instantiated. Here are some examples of setting variables in various ways:
DECLARE @intvariable @datevariable @maxorderdate @counter1 @counter2 INT = 2, DATE = GETDATE(), DATE = (SELECT MAX(OrderDate) FROM Orders.OrderHeader), INT, INT
SET @counter1 = 1 SELECT @counter2 = -1
SELECT @intvariable, @datevariable, @maxorderdate, @counter1, @counter2
Caution
vaRiabLe aSSiGnMent
One of the most common mistakes is to forget that, with the exception of a table variable, variables contain scalar values. If you assign the results of a SELECT statement to a variable, you must ensure that only a single row is returned from the SELECT statement. If the SELECT statement returns more than one row, the variable is set to the value corresponding to the last row in the result set and all other values in the result set are discarded.
A variable can be used to perform calculations, control processing, or populate a search argument (SARG) in a query. You can perform calculations with variables using either a SET or a SELECT statement. SQL Server 2008 introduces a more compact way of assigning values to variables using a calculation:
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