[英]Using tsql how to determine which column of a compound foreign key corresponds to which column of a compound primary/unique key?
我想放一个sql查询,该查询将向我显示复合外键的哪些列对应于其主键/唯一键的哪些列。
例如,如果数据库具有
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)
然后我想查询返回
| Pk/Uk | PK/UK Column | FK | FK Column |
--------------------------------------------
| UK_CB | C | FK_TA | D |
| UK_CB | B | FK_TA | E |
如果可能,我宁愿仅使用INFORMATION_SCHEMA视图。
我知道INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE,但这只为我提供了特定约束中的列。
我可以加入INFORMATION_SCHEMA.COLUMNS并以顺序位置进行操作,但是这错误地假设关键引用是按顺序排列的。
有没有一种查询数据库以获取复合键之间的列对应关系的方法?
我在INFORMATION_SCHEMA视图中找不到经过验证的列顺序。 但是,如果可以使用系统目录视图(而不是INFORMATION_SCHEMA视图),则可以执行以下操作(这是一个sql小提琴 )。 我看不到将其与pk / uk关联的直接方法,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
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.