create index语句用来在表中创建索引。索引的作用提高数据库查询的效率,这个作用对用户来说是透明的,其作用只是对MySQL引擎来说的。 Syntax:CREATE[UNIQUE|FULLTEXT|SPATIAL] INDEX index_name [index_type]ONtbl_name (index_col_name,...) [index_option] [algorithm_option|lock_option] ... index_col_name...
CREATE COLUMNSTORE INDEX Transact-SQL 语法约定 语法 适用于 SQL Server、Azure SQL 数据库和 Azure SQL 托管实例的语法 syntaxsql 复制 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column [ ASC | DESC ] [ ,...n ] ) [ INCLUDE ( column_name [ ,...n ] ) ] ...
SyntaxSQL Server、Azure SQL Database、Azure SQL 受控執行個體的語法syntaxsql 複製 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column [ ASC | DESC ] [ ,...n ] ) [ INCLUDE ( column_name [ ,...n ] ) ] [ WHERE <filter_predicate> ] [ WITH ( <relat...
);-- 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 the SQLCREATE INDEXstatement is: CREATEINDEXindex_nameONtable_name (column_name1, colu...
Therefore: Check the syntax for creating indexes in your database.CREATE INDEX ExampleThe SQL statement below creates an index named "idx_lastname" on the "LastName" column in the "Persons" table:CREATE INDEX idx_lastname ON Persons (LastName); ...
This is an exception to the rule that the privilege set is the privileges that are held by the SQL authorization ID of the process. Syntax for CREATE INDEX CREATEUNIQUEWHERE NOT NULLINDEXindex-nameONtable-name(,column-namekey-expressionASCDESCRANDOM,BUSINESS_TIMEWITHOUT OVERLAPSWITH OVERLAPS)aux-...
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...
Syntax for SQL Server, Azure SQL Database, Azure SQL Managed Instance syntaxsql Copy CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column [ ASC | DESC ] [ ,...n ] ) [ INCLUDE ( column_name [ ,...n ] ) ] [ WHERE <filter_predicate> ] [ WITH ( <...
ALTER FULLTEXT INDEX (Transact-SQL) ALTER FUNCTION (Transact-SQL) ALTER INDEX (Transact-SQL) ALTER LOGIN (Transact-SQL) ALTER MASTER KEY (Transact-SQL) ALTER MESSAGE TYPE (Transact-SQL) ALTER PARTITION FUNCTION (Transact-SQL) ALTER PARTITION SCHEME (Transact-SQL) ALTER PROCEDURE (Transact-SQL)...
ALTER FULLTEXT INDEX (Transact-SQL) ALTER FUNCTION (Transact-SQL) ALTER INDEX (Transact-SQL) ALTER LOGIN (Transact-SQL) ALTER MASTER KEY (Transact-SQL) ALTER MESSAGE TYPE (Transact-SQL) ALTER PARTITION FUNCTION (Transact-SQL) ALTER PARTITION SCHEME (Transact-SQL) ALTER PROCEDURE (Transact-SQL)...