Question

I have the following SQL Query :

SELECT call_type FROM INCOMING_CALLS, LIVE_CALLS 

WHERE LIVE_CALLS.status='INCALL' and INCOMING_CALLS.callerid = LIVE_CALLS.callerid

AND pbl_id in ('111','190','121','111','-','111','121','303','6730','-');

Both the tables, LIVE_CALLS and INCOMING_CALLS have the column pbl_id. Which obviously results into the following error :

ERROR 1052 (23000): Column 'pbl_id' in where clause is ambiguous

I understand that it’s very simple to solve this problem by changing

pbl_id in (

to

INCOMING_CALLS.pbl_id in (

and

INCOMING_CALLS.pbl_id in (

But I can not do that as the below part is dynamically dynamically build and I do not have control over it.

AND pbl_id in ('111','190','121','111','-','111','121','303','6730','-');

I need to match the pbl_id of both tables. Any hints how can I achieve that?

Answer 1

You could use a sub-query:

select call_type
from INCOMING_CALLS ic
inner join (select distinct callerid from LIVE_CALLS
            where LIVE_CALLS.status='INCALL') lc
    on ic.callerid = lc.callerid
where 1 = 1
AND pbl_id in ('111','190','121','111','-','111','121','303','6730','-');

See it here.