[英]Using tsql how to determine which column of a compound foreign key corresponds to which column of a compound primary/unique key?
我想放一個sql查詢,該查詢將向我顯示復合外鍵的哪些列對應於其主鍵/唯一鍵的哪些列。
例如,如果數據庫具有
CREATE TABLE TA
(
B int,
C int
)
ALTER TABLE TA ADD CONSTRAINT [UK_CB] UNIQUE NONCLUSTERED
(
C ASC,
B ASC
)
CREATE TABLE TB
(
D int,
E int
)
ALTER TABLE TB ADD CONSTRAINT [FK_TA] FOREIGN KEY (D, E) REFERENCES TA(C, B)
然后我想查詢返回
| Pk/Uk | PK/UK Column | FK | FK Column |
--------------------------------------------
| UK_CB | C | FK_TA | D |
| UK_CB | B | FK_TA | E |
如果可能,我寧願僅使用INFORMATION_SCHEMA視圖。
我知道INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE,但這只為我提供了特定約束中的列。
我可以加入INFORMATION_SCHEMA.COLUMNS並以順序位置進行操作,但是這錯誤地假設關鍵引用是按順序排列的。
有沒有一種查詢數據庫以獲取復合鍵之間的列對應關系的方法?
我在INFORMATION_SCHEMA視圖中找不到經過驗證的列順序。 但是,如果可以使用系統目錄視圖(而不是INFORMATION_SCHEMA視圖),則可以執行以下操作(這是一個sql小提琴 )。 我看不到將其與pk / uk關聯的直接方法,但是您可以在pk / uk表中找到列:
SELECT
fk.name as constraint_name,
sfkc.constraint_column_id,
sfkc.parent_column_id,
fkt.name as fk_table,
fkc.name as fk_column,
sfkc.referenced_column_id,
pkt.name as pk_table,
pkc.name as pk_column
FROM sys.foreign_keys AS fk
JOIN sys.foreign_key_columns AS sfkc
ON fk.object_id = sfkc.constraint_object_id
JOIN sys.tables AS fkt
ON sfkc.parent_object_id = fkt.object_id
JOIN sys.columns as fkc
ON fkt.object_id = fkc.object_id
AND sfkc.parent_column_id = fkc.column_id
JOIN sys.tables AS pkt
ON sfkc.referenced_object_id = pkt.object_id
JOIN sys.columns as pkc
ON pkt.object_id = pkc.object_id
AND sfkc.referenced_column_id = pkc.column_id
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