SQL 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 ( <relational...
重要 在SQL Server 的未来版本中,将删除此后向兼容的关系索引语法结构。请避免在新的开发工作中使用此语法结构,并计划修改当前使用此功能的应用程序。改用 <relational_index_option> 中指定的语法结构。syntaxsql 复制 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column_name [...
CREATE UNIQUE CLUSTERED INDEX IndexPOView ON POView (PurchaseOrderID) GO 你可以对比一下查询语句与查询索引视图的执行计划,索引视图的方式提供了更好的查询性能: SQL Server 的查询优化器总是尝试找到最佳的执行计划,有时候虽然你建立了索引视图,但优化器依然使用了原始表上的索引,此时你可以使用 WITH NOEXPAND ...
Bonus: The new search engine can index up to 2 billion rows. (The limit on SQL 2000 was between three and 30 million rows.) ;T-SQL improvements–Look for thesaurus support as well as a full-text index creation syntax very similar to the CREATE INDEX syntax used for tables. You may ...
The syntax of the CREATE INDEX, CREATE TABLE, and ALTER TABLE statements supports the keywords ASC (ascending) and DESC (descending) on individual columns in indexes and constraints.Specifying the order in which key values are stored in an index is useful when queries referencing the table...
('18+included_columns19+')','') AS Create_Index_Syntax20FROM sys.dm_db_missing_index_details AS D21INNER JOIN sys.dm_db_missing_index_groups G ON G.index_handle =D.index_handle22INNER JOIN sys.dm_db_missing_index_group_stats GS ON G.index_group_handle =GS.group_handle23INNER ...
适用于: SQL Server Azure SQL 数据库 Azure SQL 托管实例为指定的表创建 XML 索引。 可在向表中填入数据前创建索引。 可通过指定限定的数据库名称,为另一个数据库中的表创建 XML 索引。备注 若要创建关系索引,请参阅 CREATE INDEX (Transact-SQL)。 有关如何创建空间索引的信息,请参阅 CREATE SPATIAL INDEX...
CREATE OR REPLACE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition 1. 2. 3. 4. 5. SQL 撤销视图 您可以通过 DROP VIEW 命令来删除视图。 SQL DROP VIEW Syntax DROP VIEW view_name 1. 2. SQL Server Date 函数 ...
有关创建 XML 索引的信息,请参阅CREATE XML INDEX (Transact-SQL)。 WHERE <filter_predicate> 通过指定索引中要包含哪些行来创建筛选索引。筛选索引必须是对表的非聚集索引。为筛选索引中的数据行创建筛选统计信息。 筛选谓词使用简单比较逻辑且不能引用计算列、UDT 列、空间数据类型列或 hierarchyID 数据类型列。比...
CREATE DATABASE- creates a new database ALTER DATABASE- modifies a database CREATE TABLE- creates a new table ALTER TABLE- modifies a table DROP TABLE- deletes a table CREATE INDEX- creates an index (search key) DROP INDEX- deletes an index ...