Use SQL Server Management StudioCreate a clustered index from Object ExplorerIn Object Explorer, expand the table on which you want to create a clustered index. Right-click the Indexes folder, point to New Index, and select Clustered Index... In the New Index dialog box, on the General page...
1. 什么是聚合索引(clustered index) / 什么是非聚合索引(nonclustered index)? 可以把索引理解为一种特殊的目录。微软的SQL SERVER提供了两种索引:聚集索引(clustered index,也称聚类索引、簇集索引)和非聚集索引(nonclustered index,也称非聚类索引、非簇集索引)。下面,我们举例来说明一下聚集索引和非聚集索引的区...
SQL Server automatically creates indexes when PRIMARY KEY and UNIQUE constraints are defined on table columns. For example, when you create a table with a UNIQUE constraint, Database Engine automatically creates a nonclustered index. If you configure a PRIMARY KEY, Database Engine automatically ...
SQL Server automatically creates indexes when PRIMARY KEY and UNIQUE constraints are defined on table columns. For example, when you create a table with a UNIQUE constraint, Database Engine automatically creates a nonclustered index. If you configure a PRIMARY KEY, Database Engine automatically ...
SQL Server automatically creates indexes when PRIMARY KEY and UNIQUE constraints are defined on table columns. For example, when you create a table with a UNIQUE constraint, Database Engine automatically creates a nonclustered index. If you configure a PRIMARY KEY, Database Engine automaticall...
1. 什么是聚合索引(clustered index) / 什么是非聚合索引(nonclustered index)? 2. 聚合索引和非聚合索引有什么区别? 深入浅出理解索引结构 实际上,您可以把索引理解为一种特殊的目录。微软的SQL SERVER提供了两种索引:聚集索引(clustered index,也称聚类索引、簇集索引)和非聚集索引(nonclustered index,也称非聚类...
1. 什么是聚合索引(clustered index) / 什么是非聚合索引(nonclustered index)? 可以把索引理解为一种特殊的目录。微软的SQL SERVER提供了两种索引:聚集索引(clustered index,也称聚类索引、簇集索引)和非聚集索引(nonclustered index,也称非聚类索引、非簇集索引)。下面,我们举例来说明一下聚集索引和非聚集索引的区...
Use SQL Server Management Studio Create a clustered index from Object Explorer In Object Explorer, expand the table on which you want to create a clustered index. Right-click theIndexesfolder, point toNew Index, and selectClustered Index... In...
SQL Server automatically creates indexes when PRIMARY KEY and UNIQUE constraints are defined on table columns. For example, when you create a table with a UNIQUE constraint, Database Engine automatically creates a nonclustered index. If you configure a PRIMARY KEY, Database Engine automatically creat...
CREATE NONCLUSTERED INDEX IX_EMP_NAME ON EMPLOYEES(NAME) -- 再次执行WHERE查询并含实际执行计划。 SELECT * FROM EMPLOYEES WHERE NAME = 'ABC 874000' 1. 2. 3. 4. 5. 6. Key映射查找 查询例子同上。 上例的执行计划中我们可以看到key lookup过程,这个映射查找出现的原因是我们的查询里name字段虽然可以...