SQL Server删除缺省约束
删除一列时，如果有缺省约束，得先删除约束才能删列，删除约束代码如下：DECLARE @tablename VARCHAR(100), @columnname VARCHAR(100), @tab VARCHAR(100)
SET @tablename='表名'
SET @columnname='字段名'
declare @defname varchar(100)
declare @cmd varchar(100)
select @defname = name
FROM sysobjects so
JOIN sysconstraints sc
ON so.id = sc.constid
WHERE object_name(so.parent_obj) = @tablename
AND so.xtype = 'D'
AND sc.colid =
(SELECT colid FROM syscolumns
WHERE id = object_id(@tablename) AND
name = @columnname)
select @cmd='alter table '+ @tablename+ ' drop constraint '+ @defname
if @cmd is not null
exec (@cmd)
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