版权声明:@渔闻520 https://blog.csdn.net/weixin_41060905/article/details/88318226
由于mysql不支持full join,可以用left outer join一次,加上union,再来right outer join。
SELECT a.productno,productname,quantity,price
FROM
product a
LEFT OUTER JOIN
orderdetail
ON
(a.productno=orderdetail.productno)
AND
price>400
UNION
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SELECT a.productno,productname,quantity,price
FROM
product a
RIGHT OUTER JOIN
orderdetail
ON
(a.productno=orderdetail.productno)
AND
price>400