索引可以加快数据的检索速度,并且在执行查询时可以有效地减少数据库的负载。 CREATEINDEXIX_MyVariableTable_NameON#MyVariableTable (Name); 1. 2. 以上代码创建了一个名为IX_MyVariableTable_Name的索引,它针对#MyVariableTable表的Name列进行索引。请根据实际需求修改索引名称和列名。 总结 通过以上步骤,我们成功地...
创建索引CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX index_name ON {table | view } (column [ ASC | DESC ] [,...n]) 如:为表products 创建一个簇索引 create unique clustered index pk_p_id on products(p_id) 删除索引:drop index 五、视图 视图是从一个或多个表或视图中导出的表,其结...
CreateDatedatetime)altertableTestTableVariableaddconstraintpk_TestTableVariableprimarykey(Id)createindexidx_KeyCode1onTestTableVariable(KeyCode1)createindexidx_KeyCode2onTestTableVariable(KeyCode2)createindexidx_KeyCode3onTestTableVariable(KeyCode3)createindexidx_KeyCode4onTestTableVariable(KeyCode4)createindexidx...
更确切的说,表变量可以被当成正常的表或者表表达式一样在SELECT,DELETE,UPDATE,INSERT语句中使用,但是表变量不能在类似"SELECT select_listINTO table_variable"这样的语句中使用。而在SQL Server2000中,表变量也不能用于INSERTINTO table_variable EXEC stored_procedure这样的语句中。 表变量不能做如下事情: 虽然表变...
idx.FillFactor = 50; // Create the index on the instance of SQL Server. idx.Create(); // Modify the page locks property. idx.DisallowPageLocks = true; // Run the Alter method to make the change on the instance of SQL Server. idx.Alter(); // Remove the index from...
CREATE VIEW View1 AS SELECT Colx, Coly FROM TableA, TableB WHERE TableA.ColZ = TableB.Colz; 查询计划中的联接顺序为 Table1、 Table2、 TableA、 TableB、 Table3。解析视图的索引与任何索引相同,仅当查询优化器确定在 SQL Server 的查询计划中使用索引视图有益时,SQL Server 才会选择这样做。索...
Create a nonclustered index with a unique constraint and specify the sort order SQL Copy CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); Key scenario: Starting with SQL Server 2016 (13.x), in Azure SQL Database, and in Azure SQL Managed Inst...
For more information, see Table variable deferred compilation. Indexes can't be created explicitly on table variables, and no statistics are kept on table variables. Starting with SQL Server 2014 (12.x), new syntax was introduced which allows you to create certain index types inline with the ...
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For example, the following partition switching code will not work with CDC enabled on the database, or with TableA participating in a transactional publication: SQL DECLARE@SomeVariableINT= $PARTITION.pf_test(10);ALTERTABLEdbo.TableASWITCHTOdbo.TableBPARTITION@SomeVariable; ...