例如select @@servername 声明局部标量的语权句是 declare 变量名 数据类型和长度,例如 declare @name varchar(10) */ /* #一: 系统变量 #说明: 变量由系统提供,不是用户定义的,属于服务器层面 #使用的语法 #1/查看所有的系统变量, show global /[session] variables; 2.查看满足条件的部分系统变量 show gl...
一、变量 1.系统变量:全局变量、会话变量 说明:由系统提供,属于服务器层面。如果是全局级别,则需要加 global,如果是会话级别,则需加 session,如果不写,则默认 session。全局变量不能跨重启。会话变量仅仅针对当前变量有效 ●查看所有的系统变量 show global | 【session】 variables; ●查看满足条件的部分系统变量 s...
Variables are declared in the body of a batch or procedure with the DECLARE statement and are assigned values by using either a SET or SELECT statement. Cursor variables can be declared with this statement and used with other cursor-related statements. After declaration, all variables are ...
CREATEPROCEDUREsp_MySetPassword @loginname SYSNAME, @oldSYSNAME, @newSYSNAMEAS-- Declare variables.DECLARE@login SYSNAME;DECLARE@newpassword SYSNAME;DECLARE@oldpassword SYSNAME;DECLARE@commandVARCHAR(2000);SET@login =REPLACE(@loginname,''',''');SET@oldpassword =REPLACE(@old,''',''');SET@newpa...
-- Declare the variables. SET Publisher=%instancename% SET Subscriber=%instancename% SET PublicationDB=AdventureWorks SET SubscriptionDB=AdventureWorksReplica SET Publication=AdvWorksProductsTran -- Start the Distribution Agent. -- The following command must be supplied without line breaks. "C:\Program ...
-- Declare variables used in error checking. DECLARE @ErrorVar INT; DECLARE @RowCountVar INT; -- Execute the UPDATE statement. UPDATE PurchaseOrderHeader SET EmployeeID = @EmployeeID WHERE PurchaseOrderID = @PurchaseOrderID; -- Save the @@ERROR and @@ROWCOUNT values in local ...
Variables are declared in the body of a batch or procedure with the DECLARE statement and are assigned values by using either a SET or SELECT statement. Cursor variables can be declared with this statement and used with other cursor-related statements. After declaration, all variables are ...
After declaration, all variables are initialized as NULL, unless a value is provided as part of the declaration.Transact-SQL syntax conventionsSyntaxThe following syntax is for SQL Server and Azure SQL Database:syntaxsql Copy DECLARE { { @local_variable [AS] data_type [ = value ] } | {...
SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Variables are declared in the body of a batch or procedure with the DECLARE statem...
SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Variables are declared in the body of a batch or procedure with the DECLARE statem...