2007-06-06
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Group by ,Having, Aggregate functions and top 10

1. 今天实验的收获很大，最重要的就是Mr dennis帮我指出了我的一个严重错误！the serious error about querying the ten items having the least total quantities. I didn’t understand the use of “group by” and “having” until now! They are just and mainly used for aggregate functions. 2. http://www.w3schools.com/sql/sql_groupby.asp SQL GR ...
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