SQL 复制 CREATE INDEX index1 ON schema1.table1 (column1); 在表上创建聚集索引,并为表使用由 3 个部分组成的名称 SQL 复制 CREATE CLUSTERED INDEX index1 ON database1.schema1.table1 (column1); 使用唯一约束创建非聚集索引并指定排序顺序 SQL 复制 CREATE UNIQUE INDEX index1 ON schema1.tab...
DROPINDEXmembers_last_name_i;Code language:SQL (Structured Query Language)(sql) You will learn more about how todrop an indexin the next tutorial. Creating an index on multiple columns example The following example creates an index on both last name and first name columns: ...
Using SQL Server Management Studio to create an index with nonkey columns Show 2 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric This article describes how to add included (or nonkey) columns to extend the functionality of nonclustere...
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.
Computed Columns SORT_IN_TEMPDB Disable Enable Rename Set Options Tune nonclustered indexes with missing index suggestions Disk space index DDL operations Reorganize & rebuild Specify fill factor Perform online operations Configure parallel operations Index Properties F1 Help Columnstore indexes SQL Graph Seq...
Multiple unique nonclustered indexes can be defined on a table. For more information, see CREATE 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 le...
Multiple unique nonclustered indexes can be defined on a table. 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 lev...
Creates a full-text index on a table or indexed view in a database in SQL Server. Only one full-text index is allowed per table or indexed view, and each full-text index applies to a single table or indexed view. A full-text index can contain up to 1024 columns....
创建视图时,有关该视图的信息将存储在下列目录视图中:sys.views、sys.columns和sys.sql_expression_dependencies。 语句的文本CREATE VIEW存储在sys.sql_modules目录视图中。 对使用数值或浮点表达式定义的视图使用索引的查询的结果可能与不使用视图索引的类似查询不同。 此差异可能是在基础表上INSERTDELETE舍入错误或UPDA...
segment_attributes_clause::=,index_subpartition_clause::=) index_subpartition_clause::= Semantics UNIQUE SpecifyUNIQUEto indicate that the value of the column (or columns) upon which the index is based must be unique. Restrictions on Unique Indexes ...