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PostgreSQL笔记-查看表的主外键等约束关系

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SELECT
tc.constraint_name, tc.table_name, kcu.column_name,
ccu.table_name AS foreign_table_name,
ccu.column_name AS foreign_column_name,
tc.is_deferrable,tc.initially_deferred
FROM
information_schema.table_constraints AS tc
JOIN information_schema.key_column_usage AS kcu ON tc.constraint_name = kcu.constraint_name
JOIN information_schema.constraint_column_usage AS ccu ON ccu.constraint_name = tc.constraint_name
WHERE constraint_type = 'FOREIGN KEY' AND tc.table_name = 'your table name';

constraint_type有四种:UNIQUE、PRIMARY KEY、CHECK、FOREIGN KEY

通过修改上边sql语句的table_name和constraint_type来进行相应的查询

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