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 an index). Also, SQL Server does not maintain statistics on a table variable,...
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...
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', ...
create table #GymEvent(Player varchar(10),[Subject] nvarchar(5),Scoredecimal(4,2)) go insert into #GymEvent values('Sara','跳马',9.25) insert into #GymEvent values('Cassie','跳马',8.75) insert into #GymEvent values('Delaney','跳马',NULL) insert into #GymEvent values('Sammi','跳马'...
下列範例使用 INDEX 提示。 第一個範例會指定單一索引。 第二個範例會指定單一數據表參考的多個索引。 在這兩個範例中,由於您在使用別名的數據表上套用 INDEX 提示,TABLE HINT 子句也必須指定與公開物件名稱相同的別名。 此範例會使用 AdventureWorks2022 資料庫。 SQL 複製 EXEC sp_create_plan_guide @name = ...
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...
ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a piv...
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, ...
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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...