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
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 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...