CREATEINDEX index_name ONtable_name (column1, column2, ...); 创建唯一索引的语法如下: CREATEUNIQUEINDEX index_name ONtable_name (column1, column2, ...); 注意:创建索引的语法在不同的数据库中有所不同。因此,请检查您的数据库中创建索引的语法。 CREATE INDEX 示例 下面的 SQL 语句在 "Persons" ...
CREATE INDEX 既可以创建一个可改变表的物理顺序的簇索引,也可以创建提高查询性能的非簇索引。其语法如下: CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX index_name ON {table | view } column [ ASC | DESC ] [,...n]) [WITH [PAD_INDEX] [ [, ] FILLFACTOR = fillfactor] [ [, ] IGNORE_D...
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。
CREATE INDEX 既可以创建一个可改变表的物理顺序的簇索引,也可以创建提高查询性能的非簇索引。其语法如下: CREATE [UNIQUE] [CLUSTERED | NONCLUSTERED] INDEX index_name ON {table | view } column [ ASC | DESC ] [,...n]) [WITH [PAD_INDEX] [ [, ] FILLFACTOR = fillfactor] [ [, ] IGNORE_D...
SQL Copy USE AdventureWorks2022; GO -- Creates a nonclustered index on the Person.Address table with four included (nonkey) columns. -- index key column is PostalCode and the nonkey columns are -- AddressLine1, AddressLine2, City, and StateProvinceID. CREATE NONCLUSTERED INDEX IX_Address...
SQL USEAdventureWorks2022; GO-- Create a new table with three columns.CREATETABLEdbo.TestTable ( TestCol1INTNOTNULL, TestCol2NCHAR(10)NULL, TestCol3NVARCHAR(50)NULL); GO-- Create a clustered index called IX_TestTable_TestCol1-- on the dbo.TestTable table using the TestCol1 column.CREAT...
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 ...
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...
CREATE TABLE dbo.TestTable ( TestCol1 INT NOT NULL, TestCol2 NCHAR(10) NULL, TestCol3 NVARCHAR(50) NULL ); GO -- Create a clustered index called IX_TestTable_TestCol1 -- on the dbo.TestTable table using the TestCol1 column. CREATE CLUSTERED INDEX IX_TestTable_TestCol1 ON dbo.Tes...
CREATE [ NONCLUSTERED ] COLUMNSTORE INDEX index_name ON { database_name.schema_name.table_name | schema_name.table_name | table_name } ( column [ , ...n ] ) [ ORDER (column [ , ...n ] ) ] [ WHERE <filter_expression> [ AND <filter_expression> ] ] [ WITH ( <with_option>...