mysql數據庫基本操作（三）

創建兩個表：student和teacher 內連接：student和teacher表中相同的記錄會顯示 select u.id,u.name,u.class_name p.name from student as u inner join teacher as p on u.class_name = p.class_name; 左連接：student表中被查詢的字段會被全部顯示出來，而teache

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