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mysql相同内容的字段合并为一条的方法_MySQL

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Release： 2016-06-01 13:42:17
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mysql相同内容的字段合并为一条的方法_MySQL
 从两个表中内联取出的数据，其中category_name字段有相同内容，想将具有相同内容的字段进行合并，将amount字段进行加法运算，变成下表中的内容 mysql相同内容的字段合并为一条的方法_MySQL SELECT c.category_name, count(*) AS task_num, sum( t.amount ) AS amount_numFROM cs_witkey_tasks AS t    INNER JOIN cs_witkey_category AS c ON t.category_id = c.cidGROUP BY c.category_name DESC 应该用group by而不是order by。   作者 岳冠群 bitsCN.com

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