mysql分組后取前三條 mysql分組后,取每組的前3條數(shù)據(jù)(并且有順序)?
mysql分組后,取每組的前3條數(shù)據(jù)(并且有順序)?不列出表結(jié)構(gòu)及測試數(shù)據(jù),只能這樣大概寫個思路了:select a.* from(select t1.*,(select count(*) 1 fro
mysql分組后,取每組的前3條數(shù)據(jù)(并且有順序)?
不列出表結(jié)構(gòu)及測試數(shù)據(jù),只能這樣大概寫個思路了:select a.* from(select t1.*,(select count(*) 1 from 表 where 分組字段=t1.分組字段 and 排序字段
數(shù)據(jù)庫排序并且取每個分組的前三條?
select*from(selectrow_number()over(partitionby"分組"orderby"日期")asrownum--排序并分組,*--所需顯示的字段from表)asTwhereT.rownum=1對每組的數(shù)據(jù)按日期排序并加上行號取出時只取行號為1,也就是第一條數(shù)據(jù)。
Oracle以某字段分組,以某字段排序,取前幾條?
select Tt.sal, Tt.row1, Tt.deptnofrom (select t.sal sal, rownum row1, t.deptno deptnofrom (select sum(sal) sal, deptnofrom empgroup by deptnoorder by deptno) t) ttwhere Tt.row1
Oracle以某字段分組,以某字段排序,取前幾條?
selectTt.sal,Tt.row1,Tt.deptnofrom(selectt.salsal,rownumrow1,t.deptnodeptnofrom(selectsum(sal)sal,deptnofromempgroupbydeptnoorderbydeptno)t)ttwhereTt.row1<=2
求mysql語句取前100條數(shù)據(jù)做排序在取其中的前5條?
測試:表名test,字段,id,name select*from(select*fromtestorderbyiddesclimit100)astmplimit5