sql server 约束 查找

--1.主键约束
SELECT
tab.name AS [表名],
idx.name AS [主键名称],
col.name AS [主键列名]
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);--2.唯一约束
SELECT
tab.name AS [表名],
idx.name AS [约束名称],
col.name AS [约束列名]
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); --3.外键约束
select
oSub.name AS [子表名称],
fk.name AS [外键名称],
SubCol.name AS [子表列名],
oMain.name AS [主表名称],
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) --4.Check约束
SELECT
tab.name AS [表名],
chk.name AS [Check约束名],
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)