mysql連接查詢

SELECT * FROMt_book,t_bookType; 內查詢:      查詢這2各表內t_book(bookTypeId)等於t_bookType(id)字段的列 SELECT  *  FROMt_book,t_bookType WHERE t_book.bookTypeId=t_bookType.id;      和上面語句查詢意思相同，只是查詢*中多餘的改成只顯示bookName,

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