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【
PLSQL
】
取分组最大值记录
作者:
Dezai.CN
/ 发布于
2012/7/16
/
874
取分组最大值记录
<div> <div>子查询:</div> <span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(223, 223, 223); -webkit-text-size-adjust: auto; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">select * from 表 where (序号,名称) in (select max(序号),名称 from 表 group by 名称)</span> 分析函数: <span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">select 序号 , 名称 , 数量 from <br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">(select 序号 , 名称 , 数量 <br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">,row_number() over(partition by 名称 order by 序号 desc ) rn<br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">form tab_name )<br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">where rn=1<br style="word-wrap: break-word;" /> <br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">或<br style="word-wrap: break-word;" /> </span> <span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">select 序号 , 名称 , 数量 from <br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">(select 序号 , 名称 , 数量 <br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">, max(序号) over(partition by 名称) rn<br style="word-wrap: break-word;" /> </span><span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241);">form tab_name )<br style="word-wrap: break-word;" /> </span> <span style="font: 12px/18px verdana, arial, helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(241, 241, 241); -webkit-text-size-adjust: auto; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">where rn=序号</span> 注意:max的字段只能是number类型字段,如果是date类型的,会提示错误。date类型用上面的row_number()来做就可以了。 <hr width="100%" size="2" /> <div><span style="font: bold 14px/26px Arial; text-align: left; color: rgb(46, 59, 0); text-transform: none; text-indent: 8px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(238, 235, 231); -webkit-text-size-adjust: auto; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">Oracle 分组 取第一条记录</span></div> <div><span style="font: 14px/18px Arial; color: rgb(102, 102, 102); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; background-color: rgb(238, 235, 231); -webkit-text-size-adjust: auto; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;">id apply_id<br style="line-height: normal;" /> 1 1<br style="line-height: normal;" /> 2 1<br style="line-height: normal;" /> 3 1<br style="line-height: normal;" /> 4 2<br style="line-height: normal;" /> 5 2<br style="line-height: normal;" /> 6 3<br style="line-height: normal;" /> 7 3<br style="line-height: normal;" /> 8 3<br style="line-height: normal;" /> <br style="line-height: normal;" /> 取出<br style="line-height: normal;" /> id apply_id<br style="line-height: normal;" /> 3 1<br style="line-height: normal;" /> 5 2<br style="line-height: normal;" /> 8 3<br style="line-height: normal;" /> <br style="line-height: normal;" /> select alx_a.id<br style="line-height: normal;" /> from <br style="line-height: normal;" /> (select id,apply_id,rownum rid from 表) alx_a,<br style="line-height: normal;" /> (select id,apply_id,rownum rid from 表) alx_b<br style="line-height: normal;" /> where alx_a.apply_id = alx_b.apply_id and alx_a.id <= alx_b.id <br style="line-height: normal;" /> group by alx_a.id,alx_a.apply_id<br style="line-height: normal;" /> having count(*) = 1</span></div> </div>
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