Using SQL Server Management Studio To create a nonclustered index by using the Table Designer In Object Explorer, expand the database that contains the table on which you want to create a nonclustered index. Expand theTablesfolder. Right-click the table on which you want to create a nonclust...
Using SQL Server Management Studio To create a nonclustered index by using the Table Designer In Object Explorer, expand the database that contains the table on which you want to create a nonclustered index. Expand theTablesfolder. Right-click the table on which you want to create a nonclust...
SQL Server Non-Clustered Indexes(非聚集索引) 简介 使用SQL ServerCREATE [NONCLUSTERED] INDEX创建非聚集索引 示例 A)使用CREATE INDEX语句在一列上添加一个聚集索引 B)使用CREATE INDEX语句在多列上添加一个聚集索引 简介 非聚集索引是一种数据结构,可以提高查询速度。与聚集索引不同,非聚集索引将索引数据与表中...
在前面的查询中,SQL Server 读取根节点页并检索每个叶节点页和行以进行数据检索。 现在让我们在 SQL Server的EmpContactNumber列上的Employee表上 创建一个唯一的非聚集索引作为索引键: CREATEUNIQUENONCLUSTERED INDEX IX_NonClustered_EmployeeONdbo.Employee(EmpContactNumber); 1 在我们解释这个索引之前,重新运行 SEL...
sql server 新建索引 sqlserver怎么建立索引 创建索引 数据库创建索引操作图: 第一种创建索引方式: 第二种创建索引方式: 第三中创建索引的方式: 使用CREATE INDEX语句创建索引 CREATE[UNIQUE] [ CLUSTERED | NONCLUSTERED ] INDEX索引名 ON{表名|视图名} (列名[ASC|DESC] [ ,...n ] )...
CREATE NONCLUSTERED INDEX Index_Name ON Person(Name) 1. 2. 然后执行查询: SELECT Name,Age FROM Person where Name = '欧琳琳' 1. 执行计划如下: 上面的执行过程是,先扫描非聚集索引列,找到聚集索引,然后在通过聚集索引定位到数据。 下面我们删除掉刚才那个索引,再建过另外一个。
应该使他们快速地使任何数据库专业人员“快速” SQL Server索引阶段1中的级别1通常引入了SQL Server索引...
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...
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...
When you create a UNIQUE constraint, a unique nonclustered index is created to enforce a UNIQUE constraint by default. You can specify a unique clustered index if a clustered index on the table doesn't already exist. An index created as part of the constraint is automatically given the same...