Example The following example creates a unique index on the MyCustomers table. Copy CREATE TABLE MyCustomers (CustID int, CompanyName nvarchar(50)); CREATE UNIQUE INDEX idxCustId ON MyCustomers (CustId); Concepts Query Performance Tuning (SQL Server Compact) Database ObjectsEnglish (United States) Your Privacy Choices Theme...
因为聚集索引上有非聚集索引的依赖性,用单独的DROP INDEX 和 CREATE INDEX语句重建聚集索引将导致所有非聚集索引被重建两次(DROP,行定位器指向堆表数据行指针,CREATE行定位器指向新的聚集键值)。为了避免这种情况,使用CREATE INDEX语句的DROP_EXISTING子句来在一个单独的原子步骤中重建聚集索引。相似地,也可以在非聚集索...
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 ( <...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance This article describes how to create indexes on a view. The first index created on a view must be a unique clustered index. After the unique clustered index has been created, you can create more nonclustered indexes. ...
SQL Server Native Client OLE DB 访问接口公开了IIndexDefinition::CreateIndex函数,从而允许使用者对 SQL Server 表定义新的索引。 SQL Server Native Client OLE DB 访问接口将表索引创建为索引或约束。SQL Server 向表所有者、数据库所有者和特定管理角色的成员提供了约束创建特权。默认情况下,只有表所有者才能对...
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 ( <...
SQL Server 2005 (9.x) allowed these values, so this problem can occur when creating indexes in a database generated in SQL Server 2005 (9.x). For more information, see Compare Typed XML to Untyped XML. Example: Create a primary XML index Table T (pk INT PRIMARY KEY, xCol XML) ...
OLE DB Driver for SQL Server 會公開 IIndexDefinition::CreateIndex 函數,讓取用者定義 SQL Server 資料表的新索引。 OLE DB Driver for SQL Server 會建立資料表索引作為索引或條件約束。 SQL Server 會將建立條件約束的權限提供給資料表擁有者、資料庫擁有者,以及特定系統管理角色的成員。 根據預設,...
To removeINDEXfrom a table, we can use theDROP INDEXcommand. For example, SQL Server DROPINDEXColleges.college_index; PostgreSQL, Oracle DROPINDEXcollege_index; MySQL ALTERTABLECollegesDROPINDEXcollege_index; Here, the SQL command removes an index namedcollege_indexfrom theCollegestable. ...
Create an indexed view: a T-SQL exampleThe following example creates a view and an index on that view, in the AdventureWorks database.SQL Kopiraj --Set the options to support indexed views. SET NUMERIC_ROUNDABORT OFF; SET ANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, ...