WITH TABLENAME AS () 类似于临时表用法提高性能

WITH
语句如下写法 其执行计划可以看的出，先执行一次查询，然后在进行二次统计。原来union all
每个分句部分都要进行一次统计查询。 t_prouser_suc
每周有2
千万条数据

原来采用create table t_tmp
临时表
又制造更多的物理IO

使用 oracle
临时表法 写法上很麻烦；

with
就只能用于到一条语句中；不能用到同个过程多条语句里；

INSERT

INTO

t_buy_range_analyze




with

t_lotbuymone
as

(




SELECT

f_lotid,f_lotname,f_username,

sum

(f_paymoney) F_BUYMONEY




FROM

t_prouser_suc t




WHERE

f_yearweek =

'201020'




GROUP

BY

F_LOTID,f_lotname,f_username



)




select

a.f_lotid,a.f_lotname,f_start,f_end,

count

(f_username),

sum

(f_buymoney)




from



(




select

*
from

t_lotbuymone




union

all




select

-

10

as

f_lotid,
'

数

'

as

f_lotname,f_username,

sum

(F_BUYMONEY)
as

F_BUYMONEY




from

t_lotbuymone



where

f_lotid
in

(

select

Distinct

f_lotid
from

t_base_lotclass

where

f_Lotbigid =

4

)




group

by

f_username




union

all




select

-

20

as

f_lotid,
'

竞

'

as

f_lotname,f_username,

sum

(F_BUYMONEY)
as

F_BUYMONEY




from

t_lotbuymone



where

f_lotid
in

(

select

Distinct

f_lotid
from

t_base_lotclass

where

f_Lotbigid =

3

)




group

by

f_username



) a




inner

join

t_prod_buyrang_config
b
on

a.f_lotid=b.f_lotid
and

a.f_buymoney
>= b.f_start
and

a.f_buymoney< b.f_end




group

by

a.f_lotid,a.f_lotname,f_start,f_end