大约有 41,000 项符合查询结果（耗时：0.0085秒） [XML]
oracle group 取每组第一条 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
....type , z.code ,ROW_NUMBER()
OVER(PARTITION BY z.type ORDER BY z.code) AS code_id
FROM group_info z
)
WHERE code_id =1;
这里涉及到的over()是oracle的分析函数。
参考sql reference文档：
Analytic functions compute an aggregate value based on a group of rows. They differ fr...
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