sql server 約束 查詢

fk_ 外來鍵

主鍵約束

select
tab.name as [表名],
idx.name as [主鍵名稱],
col.name as [主鍵列名]
from
sys.indexes idx
join sys.index_columns idxcol 
on (idx.object_id = idxcol.object_id 
and idx.index_id = idxcol.index_id 
and idx.is_primary_key = 1)
join sys.tables tab
on (idx.object_id = tab.object_id)
join sys.columns col
on (idx.object_id = col.object_id
and idxcol.column_id = col.column_id);
唯一約束
select
tab.name as [表名],
idx.name as [約束名稱],
col.name as [約束列名]
from
sys.indexes idx
join sys.index_columns idxcol 
on (idx.object_id = idxcol.object_id 
and idx.index_id = idxcol.index_id 
and idx.is_unique_constraint = 1)
join sys.tables tab
on (idx.object_id = tab.object_id)
join sys.columns col
on (idx.object_id = col.object_id
and idxcol.column_id = col.column_id);
外來鍵約束
select 
osub.name as [子表名稱],
fk.name as [外來鍵名稱],
subcol.name as [子表列名],
omain.name as [主表名稱],
maincol.name as [主表列名]
from 
sys.foreign_keys fk 
join sys.all_objects osub 
on (fk.parent_object_id = osub.object_id)
join sys.all_objects omain 
on (fk.referenced_object_id = omain.object_id)
join sys.foreign_key_columns fkcols 
on (fk.object_id = fkcols.constraint_object_id)
join sys.columns subcol 
on (osub.object_id = subcol.object_id 
and fkcols.parent_column_id = subcol.column_id)
join sys.columns maincol 
on (omain.object_id = maincol.object_id 
and fkcols.referenced_column_id = maincol.column_id)
check約束
select
tab.name as [表名],
chk.name as [check約束名],
col.name as [列名],
chk.definition
from
sys.check_constraints chk
join sys.tables tab
on (chk.parent_object_id = tab.object_id)
join sys.columns col
on (chk.parent_object_id = col.object_id
and chk.parent_column_id = col.column_id)

Sql Server 約束查詢

主鍵約束 select tab.name as 表名 idx.name as 主鍵名稱 col.name as 主鍵列名 from sys.indexes idx join sys.index columns idxcol on idx.object id idxcol.object id and ...

sql server 約束 查詢

fk 外來鍵 主鍵約束 select tab.name as 表名 idx.name as 主鍵名稱 col.name as 主鍵列名 from sys.indexes idx join sys.index columns idxcol on idx.object id idxcol.object ...

sql server 查詢欄位上的約束

1.當欄位沒有預設值或者約束的時候可以使用 alter table table name drop column column name 來刪除。當有預設值的時候應該先刪除預設值，然後再刪除此列，不然會報錯。具體方法如下 select b.name from sysobjects b join sy...