本课内容目前为英文。
From numbers to names
posts stores user_id 3, but your feed shows "leila". A join combines rows from two tables wherever a condition matches, and it is the most important tool in a relational database.
本课内容目前为英文。
posts stores user_id 3, but your feed shows "leila". A join combines rows from two tables wherever a condition matches, and it is the most important tool in a relational database.