标签:
数据格式:
分组取第一条的效果:
sql语句:
SELECT * FROM ( SELECT ROW_NUMBER() OVER(PARTITION BY x ORDER BY y DESC)rn, test1.* FROM test1) WHERE rn = 1 ;
oracle分组后取每组第一条数据
原文地址:http://www.cnblogs.com/gavenQin/p/5764229.html