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declare @dfname varchar(50)
select @dfname=a.name
from sysobjects a
inner join syscomments b on a.id=b.id
inner join sysconstraints c on c.constid=a.id
inner join syscolumns d on c.colid=d.colid and c.id=d.id
where a.xtype='D' and object_name(d.id)='±íÃû' and d.name='ÁÐÃû'
if @dfname is not null
exec('alter table ±íÃû drop constraint '+@dfname)
Go
alter table ±íÃû drop column ÁÐÃû
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{
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