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sqlite: ambiguous column name解决方法

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2016-06-07 15:21:542305browse

sqlite: ambiguous column name解决方法 SQLite数据库查询中的BUG 如下语句: select t_id,t_name,t_address,gid ,deviceName,gName from tempHum as th,device as de,igroup as gr where th.deviceid = de.deviceid and th.gid = gr.gid 在执行时报: ambig

sqlite: ambiguous column name解决方法

 

SQLite数据库查询中的BUG

 

   如下语句:

    select t_id,t_name,t_address,gid ,deviceName,gName

    from tempHum as th,device as de,igroup as gr 
   where th.deviceid = de.deviceid and th.gid = gr.gid

 

在执行时报:

ambiguous column name:gid,

 

 

   很奇怪的是我只查询了一遍gid列,因为gid在两张表里面都有,一张里面是主键,一张里面是外键。而且在Mysql中没有出现这样的错误,很是奇怪。

 

以前碰到过,因为当时用的是 select * ......,又因为那一列没有用,所有就没管,今天出现类似的情况,却无法避免,经过摸索已解决

 

select t_id,t_name,t_address,th.gid as gid,deviceName,gName

from tempHum as th,device as de,igroup as gr

where th.deviceid = de.deviceid and th.gid = gr.gid

 

 

就是加粗的那几个代码。

 

问题虽不大,但终究是解决了,留个念。

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