摘要：
•Syntax •Group functions: –Use AVG, SUM, MIN, MAX, COUNT –Use DISTINCT keyword within group functions –NULL values in a group function •Grouping rows: –G... 阅读全文
posted @ 2009-09-28 13:37 Metisria Geo 阅读(304) 评论(0) 推荐(1)
posted @ 2009-09-28 13:37 Metisria Geo 阅读(304) 评论(0) 推荐(1)
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