本文实例讲述了MySQL中USING 和 HAVING 用法。分享给大家供大家参考,具体如下:
USING
用于表连接时给定连接条件(可以理解为简写形式),如
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SELECT * FROM table1
JOIN table2 ON table1.id = table2.id
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使用 USING 可以写为
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SELECT * FROM table1
JOIN table2 USING(id)
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HAVING
引入 HAVING 是因为 WHERE 无法和统计函数一起使用
如表 order (定单)有如下字段:
id, date, price, customer
查找订单总额少于2000的客户可以这样写:
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SELECT customer, SUM (price) FROM order
GROUP BY customer
HAVING SUM (price)<2000
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查找指定客户中订单超过1500的订单总额:
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SELECT customer, SUM (price) FROM order
WHERE customer= '…' OR customer = '…'
GROUP BY customer
HAVING SUM (price) > 1500
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希望本文所述对大家MySQL数据库计有所帮助。
原文链接:https://blog.csdn.net/qq_42176520/article/details/89852547