sql多表联查实例下面提供四款sql多表关联查询的实例,个个效率不一样。

sql多表联查实例下面提供四款sql多表关联查询的实例,个个效率不一样。select
* from order_info as a ,ivrlog4ivrdlvinst as b where
(a.saleorder=b.ext1_skill and b.start_date=@date1 and se_id=’55’ and
b.ext1_skill!=”) and convert(varchar(10),a.instime,112)=@date2 and
max(a.instime)

方法二

select * from order_info as a where a.saleorder=( select b.ext1_skill
from ivrlog4ivrdlvinst as b where b.start_date=@date1 and se_id=’55’
and b.ext1_skill!=”)and convert(varchar(10),max(a.instime),112)=@date2

方法三

declare @date1 varchar(20), @date2 varchar(20) set @date1=’20100812′ set
@date2=’2010-08-12′

select * from order_info as a where a.saleorder=(select b.ext1_skill
from ivrlog4ivrdlvinst as b where b.start_date=@date1 and se_id=’55’
and b.ext1_skill!=”) and convert(varchar(10),a.instime,112)=@date2 and
max(a.instime)

方法四

select b.caller, b.start_date, b.start_time, b.ext1_skill,
c.deliveryno, c.destroyresult, c.deliverydate, c.deliverytime,
c.arrangetime, c.driverphone, c.drivermobile, a.servicedate,
a.servicetime, a.workertelfrom order_info as a ,ivrlog4ivrdlvinst as b
,delivery_info as cwhere a.saleorder in (select b.ext1_skill from
ivrlog4ivrdlvinst where b.start_date=@date1 and b.se_id=’55’ and
b.ext1_skill!=”) and convert(varchar(10),a.instime,112)=@date2 order
by b.start_date desc, b.start_time desc

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