You cannot create a non-clustered index on a table variable, unless the index is a side effect of a PRIMARY KEY or UNIQUE constraint on the table (SQL Server enforces any UNIQUE or PRIMARY KEY constraints using
a.name , a.index_id , a.typeFROMSYS.indexesASAINNERJOINSYS.TABLESASBONA.OBJECT_ID=B.OBJECT_IDWHEREB.NAMELIKE'#1[_]%'ORDERBYB.CREATE_DATEASC/*从返回的结果,我们看到在系统视图表SYS.INDEXS中,创建有两个相同的索引 'IX_#1_Nr', 但注意下object_id 数据不同。在...
DECLARE @local_variable (Transact-SQL)可以使用所有内存中 OLTP 支持的数据类型以及内存优化表类型。 可将变量声明为 NULL 或 NOT NULL。 SET @local_variable (Transact-SQL) TRY...CATCH (Transact-SQL) 要优化性能,请对整个本机编译的 T-SQL 模块使用单个 TRY/CATCH...
測試與示範的程式碼如下: 02 SET ANSI_PADDING ON; GO 03 CREATE TABLE t1 ( charNull CHAR(16) NULL, charNotNull CHAR(16) NOT NULL, varcharNull VARCHAR(16) NULL, 04 varcharNotNull VARCHAR(16) NOT NULL, varbinarycol VARBINARY(8) ); GO 05 INSERT INTO t1 VALUES ('補空白', '補空白', ...
以下示例使用 INDEX 提示。 第一个示例指定单个索引。 第二个示例指定单个表引用的多个索引。 在这两个示例中,由于对使用别名的表应用 INDEX 提示,因此 TABLE HINT 子句还必须指定与公开的对象名称相同的别名。 该示例使用 AdventureWorks2022 数据库。 SQL 复制 EXEC sp_create_plan_guide @name = N'Guide1'...
Feature Inline table variables Table types cannot be declared inline with variable declarations. Table types must be declared explicitly using a CREATE TYPE statement. Feature Cursors Cursors are not supported on or in natively compiled stored procedures. When executing the procedure from the client, ...
USE[TestDB]GO/*** 对象: Table [dbo].[Person] ***/SETANSI_NULLSONGOSETQUOTED_IDENTIFIERONGOCREATETABLE[dbo].[Person]([PersonId][nchar](18)NOTNULL,[PersonName][nchar](20)NOTNULL,CONSTRAINT[PK_Person]PRIMARYKEYCLUSTERED([PersonId]ASC)WITH(PAD_INDEX=OFF, STATISTICS_NORECOMPUTE=OFF, IGNORE...
Only triggers that are natively compiled are allowed on memory-optimized tables. Natively compiledtable-valued functions. Improving temp table and table variable performance using memory optimization A natively compiled user defined function (UDF) runs faster than an interpreted UDF. Here are some thing...
WHILE loops are commonly used with cursors and use the system variable @@FETCH_STATUS to determine when to exit. For more information, see Cursors. Examples The following example demonstrates a solution for running different processes based on the number of items in...
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