Oracle 分组后取每组第一条数据的SQL如下,亲测有效:SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY T field1, T
2018-02-02 09:20:13
Oracle 分组后取每组第一条数据的SQL如下,亲测有效:SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY T field1, T
Oracle查询:取出每组中的第一条记录按type字段分组,code排序,取出每组中的第一条记录方法一:select type,min(code) from group_infogro...
MongoDB Group,max仿关系型数据库例子,通过BsonJavaScript脚本实现。相当的SQL:select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate