if exists (select * from sysobjects where id = object_id(N’[表名]’) and OBJECTPROPERTY(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 ...
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]...
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 9 判断列是否自增列 if columnproperty(...
drop table [dbo].[表名] GO --- ---列是否存在 IF COL_LENGTH( '表名','列名') IS NULL 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...
_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'...
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...
In SQL Server 2016 CTP3 objects can DIE (DROP IF EXISTS)Do you like to write following conditional DROP statements:IF OBJECT_ID('dbo.Product, 'U') IS NOT NULL DROP TABLE dbo.Product; IF EXISTS (SELECT * FROM sys.triggers WHERE name = 'trProductInsert') DROP TRIGGER tr...
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 ] ...
在SQL Server中,如果要删除表中的列,可以使用ALTER TABLE语句的DROP COLUMN子句。具体步骤如下: 1. 首先,确保你有足够的权限来执行此操作。通常,只有数据库管理员或具有...