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[英]PostgreSQL: SQL script to get a list of all tables that have a particular column as foreign key
[英]Get all the column names having a Foreign Key contraint
我正在使用 PostgreSQL。 我想编写一个查询,返回所有具有外键约束的列名以及它们引用的这些列的表名。
据我所知, information_schema
视图没有给你列名,所以你必须使用目录:
SELECT c.conrelid::regclass AS source_table,
a.attname AS column_name,
k.n AS position,
c.confrelid::regclass AS referenced_table
FROM pg_constraint AS c
CROSS JOIN LATERAL unnest(c.conkey) WITH ORDINALITY AS k(attnum, n)
JOIN pg_attribute AS a
ON k.attnum = a.attnum AND c.conrelid = a.attrelid
WHERE c.contype = 'f'
ORDER BY c.conrelid::regclass::text, k.n;
要仅获取特定表的数据,请将以下内容添加到WHERE
条件:
AND c.conrelid = 'mytable'::regclass
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