Transact-SQL 語法慣例 Syntax 下列是 SQL Server 和 Azure SQL Database 的語法: syntaxsql DECLARE{ { @local_variable[AS]data_type[ = value ] } | { @cursor_variable_nameCURSOR} } [ ,...n ] | { @table_variable_name[AS]}::=TABLE( {<column_definition>||} } [ ,......
DECLARE @Variable1 AS int, @Variable2 AS int /* 使用 SELECT */ SELECT @Variable1 = 1 /* 使用 SET */ 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 ...
Production.Product vWHEREpv.ProductID = v.ProductIDANDpv.VendorID = @vendor_id-- Variable value from the outer cursorOPENproduct_cursorFETCHNEXTFROMproduct_cursorINTO@productIF@@FETCH_STATUS <>0PRINT' <<None>>'WHILE@@FETCH_STATUS =0BEGINSELECT@message =' '+ @product PRINT @messageFETCHNEXTFR...
Production.Product vWHEREpv.ProductID = v.ProductIDANDpv.VendorID = @vendor_id-- Variable value from the outer cursorOPENproduct_cursorFETCHNEXTFROMproduct_cursorINTO@productIF@@FETCH_STATUS <>0PRINT' <<None>>'WHILE@@FETCH_STATUS =0BEGINSELECT@message =' '+ @product PRINT @messageFETCHNEXTFR...
For more information about CLR user-defined types or alias data types, see CREATE TYPE (Transact-SQL).= value Assigns a value to the variable in-line. The value can be a constant or an expression, but it must either match the variable declaration type or be implicitly convertible to that...
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 undeclared variable of another type. ...
DECLARE product_cursor CURSOR FOR SELECT v.Name FROM Purchasing.ProductVendor pv, Production.Product v WHERE pv.ProductID = v.ProductID AND pv.VendorID = @vendor_id -- Variable value from the outer cursor OPEN product_cursor FETCH NEXT FROM product_cursor INTO @product IF @@FETCH_STATUS <...
If it passes back in an OUTPUT parameter, the cursor is deallocated when the last variable referencing it is deallocated or goes out of scope. GLOBAL Specifies that the scope of the cursor is global to the connection. The cursor name can be referenced in any stored procedure or batch ...
DECLARE product_cursor CURSOR FOR SELECT v.Name FROM Purchasing.ProductVendor pv, Production.Product v WHERE pv.ProductID = v.ProductID AND pv.VendorID = @vendor_id -- Variable value from the outer cursor OPEN product_cursor FETCH NEXT FROM product_cursor INTO @product IF @@FETCH_STATUS <...
In SQL Server 2012, you can set a variable’s initial value at the same time you declare it. For example, the following line of code declares a variable named@ctrof typeintand sets its value to100: DECLARE @ctr int = 100 Previously, this functionality was possible only with stored proce...