sql的强大
我知道sql的查询很复杂,也是很强大,但就没有见过如果强大的,让大家看一句我最近刚写的,就一句sql语句将总数,百分比都出来了!
select t.*,
round(decode(nvl(all_count,0),0,0,send_count/all_count),3)*100 send_count_rate,
round(decode(nvl(all_count,0),0,0,distribute_count/all_count),3)*100 distribute_count_rate,
round(decode(nvl(all_count,0),0,0,success_count/all_count),3)*100 success_count_rate,
round(decode(nvl(all_count,0),0,0,resend_count/all_count),3)*100 resend_count_rate,
round(decode(nvl(all_count,0),0,0,failure_count/all_count),3)*100 failure_count_rate
from
(
select company_name,
sum(case when process_state=1 or process_state=2 or process_state=3 or process_state=4 or process_state=5 then 1 else 0 end) all_count,
sum(case when process_state=1 then 1 else 0 end) send_count,
sum(case when process_state=2 then 1 else 0 end) distribute_count,
sum(case when process_state=3 then 1 else 0 end) success_count,
sum(case when process_state=4 then 1 else 0 end) [...]