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SELECT t1.id, t1.channel_id, t1.sum_amount, t1.sum_date, t1.msisdn_num, t2.num, t2.id AS channel_complaint_id, case when t2.num is not null then t2.num/(t1.msisdn_num*100) else null end scale FROM ddo_channel_statistics_day t1 LEFT JOIN ddo_channel_complaint_day t2 ON t1.channel_id = t2.channel_id AND t1.sum_date = t2.sum_date
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原文地址:http://my.oschina.net/u/914897/blog/410285