mysql连接查询

SELECT * FROMt_book,t_bookType; 内查询:      查询这2各表内t_book(bookTypeId)等于t_bookType(id)字段的列 SELECT  *  FROMt_book,t_bookType WHERE t_book.bookTypeId=t_bookType.id;      和上面语句查询意思相同，只是查询*中多余的改成只显示bookName,

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