http://topic.csdn.net/u/20071211/11/cd5aef10-1dfe-498a-928d-0451bb59238b.html
sum(d.shoujia)/ cast(sum(d.danjia) as float) 将除数或被除数类型转成浮点型就行了
cast(sum(d.shoujia)/cast(sum(d.danjia) as float) * 100 as varchar(10)) + '%'
数据库集合函数混合使用
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转载自g4-gc.iteye.com/blog/1740131
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