摘要：
（一）USE NorthwindselectOrderID,count(case when Quantity between 20 and 30 then ProductID end) as '20-30',count(case when Quantity between 30 and 40 then ProductID end) as '30-40',count(case when Quanti... 阅读全文
posted @ 2007-06-06 15:06
李昀璟
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