从信息模式sqlachemy获取信息

Question

我有以下请求：

SELECT
    tc.constraint_name, tc.table_name, kcu.column_name,
    ccu.table_name AS foreign_table_name,
    ccu.column_name AS foreign_column_name
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 ccu.table_name = 'myTable'

当我在psql或datagrip中查询时，它返回了结果。当我使用sqlalchemy时，它什么也没有（行数为0的ResultProxy）。是某种限制吗？在

使用sqlalchemy请求：

^{pr2}$