Oracle：如何通过查询获取总数的百分比？-解网

问：

我有以下查询，其结果令我非常意外：

select stato, (count(1) *100) / sum(1)
from LOG_BONIFICA
group by stato;

它为所有行返回 100。应该有所不同吗？

SQL 预言机

18:39:36 SYSTEM@dwal> ed
Wrote file S:\\tools\buffer.sql

  1  select owner,
  2         count(*) group_cnt,
  3         sum(count(*)) over() total_cnt,
  4         round(100*(count(*) / sum(count(*)) over ()),2) perc
  5    from dba_objects
  6   group by owner
  7*  order by 4 desc
18:39:57 SYSTEM@dwal> /

OWNER                           GROUP_CNT  TOTAL_CNT       PERC
------------------------------ ---------- ---------- ----------
SYS                                 31609      59064      53.52
PUBLIC                              24144      59064      40.88
XDB                                  1660      59064       2.81
SYSTEM                                597      59064       1.01
WMSYS                                 332      59064        .56
EXFSYS                                312      59064        .53
IRKAZDATA                             158      59064        .27
STRMADMIN                              92      59064        .16
DBSNMP                                 55      59064        .09
RI                                     25      59064        .04
PASS                                   16      59064        .03
POTS                                   19      59064        .03
TI                                     11      59064        .02
STRMODS                                11      59064        .02
OUTLN                                  10      59064        .02
APPQOSSYS                               5      59064        .01
ORACLE_OCM                              8      59064        .01

17 rows selected.

Elapsed: 00:00:00.16

更新：甚至更简化ratio_to_report

18:53:36 SYSTEM@dwal> ed
Wrote file S:\\tools\buffer.sql

  1  select owner,
  2         round(100*ratio_to_report(count(*)) over (), 2) perc
  3    from dba_objects
  4   group by owner
  5*  order by 2 desc
18:54:03 SYSTEM@dwal> /

OWNER                                PERC
------------------------------ ----------
SYS                                 53.52
PUBLIC                              40.88
XDB                                  2.81
SYSTEM                               1.01
WMSYS                                 .56
EXFSYS                                .53
IRKAZDATA                             .27
STRMADMIN                             .16
DBSNMP                                .09
RI                                    .04
PASS                                  .03
POTS                                  .03
TI                                    .02
STRMODS                               .02
OUTLN                                 .02
APPQOSSYS                             .01
ORACLE_OCM                            .01

17 rows selected.

Elapsed: 00:00:00.20

3赞 bonCodigo 12/5/2012 #2

你指的是以下内容吗？您需要单独找到总数。

参考 SQLFIDDLE

桌子：

ID  NAME    AMOUNT  STATE
1   john    1000    fl
2   jane    5000    ga
3   james   2000    ca
4   tom     6000    ga
5   tim     8000    fl
6   jim     2000    ga
7   kate    8000    fl
8   jack    3000    tx

结果 1：

STATE   SUM(AMOUNT)
ca      2000
fl      17000
ga      13000
tx      3000

最终查询：

select t1.state, concat(
  round(((sum(t1.amount)/t2.total))*100,2),
'%') as pct
from t1, 
(select sum(amount) as total from t1) as t2
group by t1.state
;

结果：

   STATE    COUNT(T1.ID)    SUM(T1.AMOUNT)  TOTAL   PCT
   ca       1               2000           35000    5.71%
   fl       3               17000          35000    48.57%
   ga       3               13000          35000    37.14%
   tx       1               3000           35000    8.57%

3赞 yallie 9/5/2016 #3

使用ratio_to_report分析功能：

SELECT STATO, 
    COUNT(1) STATO_COUNT, 
    RATIO_TO_REPORT(COUNT(1)) OVER() * 100 STATO_PERCENT
FROM LOG_BONIFICA
GROUP BY STATO

因此，您无需自己计算总行数和比率。

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Oracle：如何通过查询获取总数的百分比？

Oracle: how to get percent of total by a query?

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