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  • sql server删除字段约束

    --查询指定表的指定约束
    select * from sysobjects where parent_obj in(select id from sysobjects where name='HIS_QUEUE') and name='InsertDatedefault'
    --删除约束
    IF  EXISTS (SELECT * FROM sys.check_constraints WHERE object_id = OBJECT_ID(N'[dbo].[CK_DF__HIS_QUEUE__Inser__3A4CA8FD]') 
    AND parent_object_id = OBJECT_ID(N'[dbo].[HIS_QUEUE]'))
    ALTER TABLE [dbo].HIS_QUEUE DROP CONSTRAINT DF__HIS_QUEUE__Inser__3A4CA8FD
    go
    --删除约束
    IF  EXISTS (SELECT * FROM sys.check_constraints WHERE object_id = OBJECT_ID(N'[dbo].[CK_InsertDatedefault]') 
    AND parent_object_id = OBJECT_ID(N'[dbo].[HIS_QUEUE]'))
    
    ALTER TABLE [dbo].HIS_QUEUE DROP CONSTRAINT InsertDatedefault
    --print('aaaa')
    go
    --新增约束
    IF  EXISTS (SELECT * FROM sys.check_constraints WHERE object_id = OBJECT_ID(N'[dbo].[CK_InsertDatedefault]') 
    AND parent_object_id = OBJECT_ID(N'[dbo].[HIS_QUEUE]'))
    ALTER   TABLE   [dbo].[HIS_QUEUE]  ADD   CONSTRAINT   InsertDatedefault   DEFAULT    (GETDATE())   FOR   [InsertDate]
    --print('bb')
    go
    

      

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  • 原文地址:https://www.cnblogs.com/YYkun/p/14779815.html
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