Question

在CUCM（11.5）中的SQL查询之后，cli返回以下结果：

device          number          loggedin_to_lg linegroup
=============== =============== ============== ======================================
CSFABCDEF      \+49325874147  f              LG-HG_BER01_49325874147      
CSFRFETRS      \+49325800848  f              LG-HG_BER01_493225800848

run sql select d.name as Device, n.dnorpattern as Number, dhd.hlog as LoggedIn_to_LG, lg.name as LineGroup 
from linegroup as lg 
inner join linegroupnumplanmap as lgmap on lgmap.fklinegroup=lg.pkid 
inner join numplan as n on lgmap.fknumplan = n.pkid 
inner join devicenumplanmap as dmap on dmap.fknumplan=n.pkid 
inner join device as d on dmap.fkdevice=d.pkid 
inner join devicehlogdynamic as dhd on dhd.fkdevice=d.pkid 
order by lg.name

但是，如果我们尝试将另一个表-extensionmobilitydynamic-内部连接到此查询并显示其中一个列，则返回时没有结果。

run sql select d.name as Device, n.dnorpattern as Number, dhd.hlog as LoggedIn_to_LG, lg.name as LineGroup, e.datetimestamp 
from linegroup as lg 
inner join linegroupnumplanmap as lgmap on lgmap.fklinegroup=lg.pkid 
inner join numplan as n on lgmap.fknumplan = n.pkid 
inner join devicenumplanmap as dmap on dmap.fknumplan=n.pkid 
inner join device as d on dmap.fkdevice=d.pkid 
inner join devicehlogdynamic as dhd on dhd.fkdevice=d.pkid 
inner join extensionmobilitydynamic as e on e.fkdevice = d.pkid 
order by lg.name

Answer 1

找不到任何匹配的行，因此INNER JOIN无法检索任何内容。您必须尝试新表的左连接，否则可能没有匹配的结果。在这种情况下，结果列将为NULL。

run sql select d.name as Device, n.dnorpattern as Number, dhd.hlog as LoggedIn_to_LG, lg.name as LineGroup, e.datetimestamp 
from linegroup as lg 
inner join linegroupnumplanmap as lgmap on lgmap.fklinegroup=lg.pkid 
inner join numplan as n on lgmap.fknumplan = n.pkid 
inner join devicenumplanmap as dmap on dmap.fknumplan=n.pkid 
inner join device as d on dmap.fkdevice=d.pkid 
inner join devicehlogdynamic as dhd on dhd.fkdevice=d.pkid 
left join extensionmobilitydynamic as e on e.fkdevice = d.pkid 
order by lg.name

SQL，CUCM：查询返回没有结果

1 个答案: