SQLServer 2008 R2查看字段约束
SQLServer 2008 R2 删除字段前检查字段的约束：
select a.name,b.name as cname
from syscolumns a
left join sysobjects b
on a.cdefault=b.id
where a.id=object_id('TableName') and a.name='FieldName'
SQLServer 2008 R2 删除字段前检查字段的约束：
select a.name,b.name as cname
from syscolumns a
left join sysobjects b
on a.cdefault=b.id
where a.id=object_id('TableName') and a.name='FieldName'
