Mysql 關鍵字JOIN，LEFT JOIN，RIGHT JOIN
數據庫多表關聯查詢 數據庫 student表spa class表3d 1. JOIN等同於INNER JOIN,即內鏈接，不知足ON條件的會直接過濾掉，不顯示 blog SELECT * FROM student s JOIN class c ON s.class_id = c.idclass 2. LEFT JOIN等同於LEFT OUTER JOIN，左外鏈接，不知足ON條件的會保留左邊那張表
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