Oracle数据库使用distinct多个字段
select DISTINCT(t.f_resume_id||t.f_resume_status),t.f_resume_status,t.f_resume_status,t.f_recruit_channel, t.f_sma
select DISTINCT(t.f_resume_id||t.f_resume_status),t.f_resume_status,t.f_resume_status,t.f_recruit_channel,
t.f_small_channel_id
from css.T_RESUME_INFO t where t.f_resume_status in (80011,80012)
distinct多个字段,当然相同的功能也可用group by 完成
select a,b,c,min(d) d
from A
group by a,b,c
通过使用 group就可以出去相同的返回结果。就不需要使用distinct了。
二者效率,最好需要哪个的时候用哪个,group by是用来分组统计的,能用disitnct的地方就不要用group by 了。
网友摘录:
用group by 和rownum嵌套,但distinct 效率高

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