做网站设计电脑需要什么配置/济南今日头条最新消息

select * from a, b left join c on b.id = c.id left join d on c.id = d.id

select 
trim(d.circuitid) as circuitid,
trim(d.Code) as Code,
trim(d.Oldname) as Oldname,
trim(d.Circuittype) as Circuittype,
trim(d.Status) as Status,
trim(d.customerid) as acustomerid,
trim(d.alinkman) as alinkman,
trim(d.zlinkman) as zlinkman,
trim(d.alinkmantel) as alinkmantel,
trim(d.zlinkmantel) as zlinkmantel,
trim(d.busi_no) as busi_no,
trim(d.service_serial) as service_serial,
trim(a.region_ID) as regionid ,
2 as SORTID
from test1 a,test2 b,test3 c,test4 d 
where trim(a.room_id)=trim(b.roomID) and trim(b.neid)=trim(c.neid) and (trim(c.portid)=trim(d.aendname) or trim(c.portid)=trim(d.zendname))