在SQL SERVER中,常用的数据类型有INT,VARCHAR,DATETIME等。 下面是一个示例,我们声明了一个整型变量@count: DECLARE@countINT 1. 给变量赋值 在声明变量之后,我们可以使用赋值语句给变量赋值。在SQL SERVER中,可以使用SET语句或者SELECT语句来给变量赋值。 使用SET语句给变量赋值的语法如下: SET@变量名=值 1. 使用...
存储过程存储过程DECLARE @variable_name data_typeSET @variable_name = valueSELECT @variable_name = column_name查询结果 序列图中,存储过程通过DECLARE语句声明一个变量,并使用SET语句将值赋给变量。此外,存储过程还可以使用SELECT语句将查询结果直接赋值给变量。 总结起来,SQL Server存储过程中的DECLARE赋值提供了一...
Finally, let's look at how to declare an INT variable in SQL Server and assign an inital value. For example: DECLARE @site_value INT = 10; This variable declaration example would declare a variable called@site_valuethat is an INT datatype. It would then set the value of the@techonthe...
在所有上述语句中,如果存在被引用的游标变量,但是不具有当前分配给它的游标,那么 SQL Server 将引发错误。 如果不存在被引用的游标变量,SQL Server 将引发与其他类型的未声明变量引发的错误相同的错误。游标变量:可以是游标类型或其他游标变量的目标。 有关详细信息,请参阅 SET @local_variable (Transact-SQL)。
在所有的這些陳述式中,如果參考的資料指標變數存在,但目前未向其配置資料指標,SQL Server 便會引發錯誤。 如果所參考的資料指標變數不存在,SQL Server 便會產生針對其他類型的未宣告變數所產生的相同錯誤。資料指標變數:可以是資料指標類型或另一個資料指標變數的目標。 如需詳細資訊,請參閱SET @local_variable (...
SET @Variable2 = 2 select f1 into v1 from tab1 select f1,f2,f3 into v1,v2,v3 from tab1 说明: 1.SELECT可以在一条语句里对多个变量同时赋值,而SET只能一次对一个变量赋值 SELECT @VAR1=’Y’,@VAR2=’N’ SET @VAR1=’Y’;SET @VAR2=’N’; ...
FunctionCallSetClause FunctionOption FunctionOptionKind FunctionReturnType FunctionStatementBody GeneralSetCommand GeneralSetCommandType GeneratedAlwaysType GenericConfigurationOption GetConversationGroupStatement GlobalFunctionTableReference GlobalVariableExpression
SET CURSOR variable statement (on the right side)In all of these statements, SQL Server raises an error if a referenced cursor variable exists but doesn't have a cursor currently allocated to it. If a referenced cursor variable doesn't exist, SQL Server raises the same error raised for an...
SET CURSOR variable statement (on the right side)In all of these statements, SQL Server raises an error if a referenced cursor variable exists but doesn't have a cursor currently allocated to it. If a referenced cursor variable doesn't exist, SQL Server raises the same error raised for an...
SET CURSOR variable statement (on the right side) In all of these statements, SQL Server raises an error if a referenced cursor variable exists but doesn't have a cursor currently allocated to it. If a referenced cursor variable doesn't exist, SQL Server raises the same error raised for an...