你好 我有两张桌子 想在他们之间建立一种关系
OH_USER(表格)
user_id (Key)
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agent_id user_id (key)
I need to get 代理代理代理 email from OH_USERS table but insted of using user_id as a key it uses agent_id as the key to relate two table. Due to which I dont get the right result. Is there any where we can specifically define which field to use as a key or its choosen whatever its kept in the database.