);-- create indexCREATEINDEXcollege_indexONColleges(college_code); Here, the SQL command creates an index namedcollege_indexon theCollegestable using thecollege_codecolumn. SQL CREATE INDEX Syntax The syntax of
(2) 单击任务板中的“Create an Index” 链接,出现如图8-3 所示的索引创建向导界面。也可以从“Tools ”菜单中选择“izards” 菜单项,则出现如图5-17 所示的选择SQL Server 向导对话框,再从树型目录中选择“Database”下的“Create Index Wizard”选项,也会出现如图8-3 所示的索引创建向导界面。 (3) 单击...
The following SQL creates an index named "idx_lastname" on the "LastName" column in the "Persons" table:CREATE INDEX idx_lastname ON Persons (LastName); If you want to create an index on a combination of columns, you can list the column names within the parentheses, separated by ...
SQL 复制 CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); 主要方案: 从Azure SQL 数据库和 Azure SQL 托管实例中的 SQL Server 2016(13.x)开始,可以在列存储索引上使用非聚集索引来提高数据仓库查询性能。 有关详细信息,请参阅 列存储索引 - 数据仓库。
In this blog, we provide a comprehensive guide with practical examples of MySQL indexes. Explore MySQL CREATE INDEX, functional indexes and more in MySQL 8.0.
CREATE INDEX 语句用于对数据库表定义索引。 可以对 XML 数据或关系数据定义索引。 CREATE INDEX 语句还用于创建索引规范(就是用来向优化器指示数据源表具有索引的元数据)。 调用 此语句可以嵌入在应用程序中,也可通过动态 SQL 语句来发出。 它是一个可执行语句,仅当 DYNAMICRULES 运行行为对于程序包有效时才能动态...
When using theFROM EXTERNAL PROVIDERclause, the login name must match the display name of an existing Microsoft Entra principal in the same tenant that the SQL instance is Arc-enabled to. Microsoft Entra users, groups, and applications can be used to create logins. ...
For more information, seeCREATE INDEX (Transact-SQL). Indexed view To create an indexed view, a unique clustered index is defined on one or more view columns. The view is executed and the result set is stored in the leaf level of the index in the same way table data is stored in a ...
The term default, in this context, is not a keyword. It is an identifier for the default filegroup and must be delimited, as in ON"default"or ON[default]SET QUOTED_IDENTIFIER (Transact-SQL) [PRIMARY] XML Creates an XML index on the specifiedxmlcolumn. When PRIMARY is specified, a cluste...
Creates an index on a specified table. An index can be created before there is data in the table.. Copy CREATE [UNIQUE] [NONCLUSTERED] INDEX index_name ON table_name (column_name [ASC|DESC][,…n]) WITH (STATISTICS_NORECOMPUTE = { ON | OFF })] Arguments Expand table Term ...