Safely Dropping Unused SQL Server Indexes New Drop If Exists Syntax in SQL Server 2016 Script out all SQL Server Indexes in a Database using T-SQL Script to Disable Non Used SQL Server Indexes Creating Indexes with SQL Server Management Studio SQL Server Non-clustered Indexes SQL Server Index ...
nameASDatabaseName ,SUSER_SNAME(owner_sid)ASDBOwnerFROMsys.databasesWHEREstate_desc<>'OFFLINE'ANDis_read_only=0ANDnameNOTIN('master','tempdb','model','distribution');DECLARE@CurrentRowNumberINT=1;DECLARE@MaxRowNumberINT;SELECT@MaxRowNumber=MAX(RowNumber)FROM@MyTable;DECLARE@SQLStringNVARCHAR(500...
对该对象的模式的 DROPIN 特权 对象的所有者(记录在该对象的目录视图的 OWNER 列中) 对该对象的 CONTROL 特权(仅适用于索引、索引规范、昵称、程序包、表和视图) 用户定义的类型的所有者(记录在 SYSCAT.DATATYPES 目录视图的 OWNER 列中)(仅当删除与用户定义的类型相关联的方法时适用) ...
(自 SQL Server 2016 (13.x) 起,您可以使用 DROP INDEX IF EXISTS 語法)。 SQL 複製 IF OBJECT_ID ('employee_insupd', 'TR') IS NOT NULL DROP TRIGGER employee_insupd; B. 卸除 DDL 觸發程序 下列範例會卸除 DDL 觸發程序 safety。 重要 由於DDL 觸發程序的範圍並不是結構描述,因此不會出現在...
Applies to: SQL Server 2008 (10.0.x) and later versions. SQL Database supports"default"as the filegroup name. Specifies a location to move the data rows that currently are in the leaf level of the clustered index. The data is moved to the new location in the form of a heap. You can...
USE tempdb; GO -- Create a synonym for the Product table in AdventureWorks2022. CREATE SYNONYM MyProduct FOR AdventureWorks2022.Production.Product; GO -- Drop synonym MyProduct. USE tempdb; GO DROP SYNONYM MyProduct; GO 另请参阅 CREATE SYNONYM (Transact-SQL) EVENTDATA (Transact-SQL)反馈...
SQL Server 2008中的临时表有两种类型,本地临时表和全局临时表。本地临时表只有创建者可以看见并使用,在创建者与SQL Server实例断开连接后,系统会自动删除本地临时表。全局临时表在创建后,对任何用户和任何连接来说,都是可见的,当引用该表的所有用户都与SQL Server实例断开连接后,系统才会将该表删除。
SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics SQL database in Microsoft Fabric Removes a certificate from the database. Important A backup of the certificate used for database encryption should be retained even if the encryption is no longer enabled on a databas...
The DROP INDEX command is used to delete an index in a table.MS Access:DROP INDEX index_name ON table_name; SQL Server:DROP INDEX table_name.index_name; DB2/Oracle:DROP INDEX index_name; MySQL:ALTER TABLE table_nameDROP INDEX index_name; ...
DROP TABLE [IF EXISTS] [db_name.]table_name; 说明:SQL中加[IF EXISTS] ,可以防止因表不存在而导致执行报错。 参数:db_name:Database名称。如果未指定,将选择当前database。table_name:需要删除的Table名称。 3、示例 以下示例演示DROP命令的使用,依次执行如下SQL语句: --删除整个表course DROP TABLE IF EX...