ORA-00937——Oracle中GROUP BY搭配CASE WHEN的一则SQL报错
写了一个SQL，语句是这样的
select to_char('countdate', 'YYYY-MM-DD') "日期",
count(case
when activetime > 60 * 60 then
count(1)
end) ">=1h",
count(case
when activetime > 120 * 60 then
count(1)
end) ">=2h",
count(case
when activetime > 180 * 60 then
count(1)
end) ">=3h",
count(case
when activetime > 240 * 60 then
count(1)
end) ">=4h",
count(case
when activetime > 300 * 60 then
count(1)
end) ">=5h",
count(case
when activetime > 360 * 60 then
count(1)
end) ">=6h"
from ELMP_ANALYSIS_LOGINTIMEDETAIL
where activetime > 60 * 60
and countdate between to_date('&1', 'YYYY-MM-DD') and
to_date('&2', 'YYYY-MM-DD')
group by to_char('countdate', 'YYYY-MM-DD')
order by 1;
执行的时候，一直报错ORA-00937，仔细检查，发现在count里面还套了一层count，导致报错，修改后的语句如下：
select countdate "日期" count(case
when activetime > 60 * 60 then
activetime
end) ">=1h",
count(case
when activetime > 120 * 60 then
activetime
end) ">=2h",
count(case
when activetime > 180 * 60 then
activetime
end) ">=3h",
count(case
when activetime > 240 * 60 then
activetime
end) ">=4h",
count(case
when activetime > 300 * 60 then
activetime
end) ">=5h",
count(case
when activetime > 360 * 60 then
activetime
end) ">=6h"
from ELMP_ANALYSIS_LOGINTIMEDETAIL
where activetime > 60 * 60
and countdate between to_date('&1', 'YYYY-MM-DD') and
to_date('&2', 'YYYY-MM-DD')
group by countdate
order by 1;来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26506993/viewspace-1783791/ ，如需转载，请注明出处，否则将追究法律责任。
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