if exists (select * fromsysobjectswhere id = object_id(N’[表名]’) andOBJECTPROPERTY(id, N’IsUserTable’) = 1) drop table [表名] if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1) drop table [表名] 3 判断...
drop database [数据库名] if exists (select * from sys.databases where name = ’数据库名’) drop database [数据库名] 2 判断表是否存在 Sql代码 if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1) drop table [表名]...
drop database [数据库名] if exists (select * from sys.databases where name = ’数据库名’) drop database [数据库名] 2 判断表是否存在 Sql代码 if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(id, N’IsUserTable’) = 1) drop table [表名]...
PRINT 'not exists' ELSE PRINT 'exists' alter table 表名 drop constraint 默认值名称 go alter table 表名 drop column 列名 go --- --判断要创建临时表是否存在 If Object_Id('Tempdb.dbo.#Test') Is Not Null Begin print '存在' End Else Begin print '不存在' End --- -- 判断要创建的存储...
drop function [dbo].[函数名] 7 获取用户创建的对象信息 SELECT [name],[id],crdate FROM sysobjects where xtype='U' 8 判断列是否存在 if exists(select * from syscolumns where id=object_id('表名') and name='列名') alter table 表名 drop column 列名 ...
_locksWHEREresource_database_id=DB_ID()ANDresource_type='OBJECT'ANDresource_associated_entity_id=OBJECT_ID('MyTable'))BEGIN-- 删除字段ALTERTABLEMyTableDROPCOLUMNMyColumn;-- 检查字段是否成功删除IFNOTEXISTS(SELECT*FROMsys.columnsWHEREobject_id=OBJECT_ID('MyTable')ANDname='MyColumn')BEGINPRINT'...
If the column data was actually being deleted from the pages allocated to the table, you'd see log records recording the actual page data; there are no such records. DROP TABLE IF EXISTS dbo.DropColumnTest; GO CREATE TABLE dbo.DropColumnTest ( rid int NOT NULL CONSTRAINT DropC...
DROPobject_typeIFEXISTSobject_name 能够用于DROP的object_type，如Tables, Database, Function, Trigger, Stored Procedure, Column, User, Type, View, Schema，皆可套用,比如：ALTER TABLE PERSONDROP COLUMN If EXISTS NAME SQL Server 2016新特性：DROP IF EXISTS 标签：basesysges.netschfunctionname...
ALTER TABLE [ IF EXISTS ] table_name SET SCHEMA new_schema; where action can be: column_clause | ADD table_constraint [ NOT VALID ] | ADD table_constraint_using_index | VALIDATE CONSTRAINT constraint_name | DROP CONSTRAINT [ IF EXISTS ] constraint_name [ RESTRICT | CASCADE ] ...
In SQL Server 2016 CTP3 objects can DIE (DROP IF EXISTS)Do you like to write following conditional DROP statements:scroll 复制 IF OBJECT_ID('dbo.Product, 'U') IS NOT NULL DROP TABLE dbo.Product; IF EXISTS (SELECT * FROM sys.triggers WHERE name = 'trProductInsert') DR...