sql server 中删除默认约束的通用sql脚本


在SQL Server 中,如果给表的一个字段设置了默认值,就会在系统表sysobjects中生成一个默认约束。
如果想删除这个设置了默认值的字段(假设此字段名column1),
执行“ALTER TABLE table1 DROP COLUMN column1”时就会报错:

The object 'DF__xxxxxxxxxxx' is dependent on column 'column1'.
ALTER TABLE DROP COLUMN column1failed because one or more objects access this column.

所以在删除此字段时需要先将系统表中的对应默认约束删除, 可以使用下面的脚本进行删除:

-- this script drops the default constraint which is generated by the setting of default value.DECLARE @tablename VARCHAR(100), @columnname VARCHAR(100), @tab VARCHAR(100)SET @tablename='CountryGroupEmailAndWaitAux'SET @columnname='actionOfHasNoValidEmail'declare @defname varchar(100)declare @cmd varchar(100)select @defname = nameFROM sysobjects so JOIN sysconstraints scON so.id = sc.constidWHERE object_name(so.parent_obj) = @tablenameAND so.xtype = 'D'AND sc.colid =(SELECT colid FROM syscolumnsWHERE id = object_id(@tablename) ANDname = @columnname)select @cmd='alter table '+ @tablename+ ' drop constraint '+ @defnameif @cmd is null print 'No default constraint to drop'exec (@cmd)

在删除对应的默认约束后,执行:
ALTER TABLE table1 DROP COLUMN column1
即可删除字段

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