SELECT * FROM a LEFT JOIN b ON a.aID = b.bID; a为主,a的数据全显示,连不上b的对应字段为空 SELECT * FROM a RIGHT JOIN b ON a.aID = b.bID; b为主,b的数据全显示,连不上a的对应字段为空 SELECT * FROM a INNER JOIN a ON a.aID = b.bID; 相当于where a.aID=b.bID
mysql的join
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转载自sangbilllee.iteye.com/blog/2043275
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