Use Joined SQL query as filter for another SQL query

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Currently I have some data that is stored in 2 tables Call_log ("A" for reference) and PEG_LOG (B for reference). In table A it stores information on calls that come into our system and gives each of them a callID. In table B it takes the Call ID and makes a new row for each step in the flow. To get all of the usable data I have to do a left join of A and B

  Call_Log.IVR_CALL_ID AS CallLogCallID,
  Call_Log.CALL_START_DTM AS CallStartTime,
  Call_Log.CALL_END_DTM AS CallEndTime,
  call_Log.XFER_GROUP AS TransferGroup,
  Call_Log.DNIS AS DNIS,
  Call_log.ANI AS ANI,
  Call_log.XFER_NBR AS TransferNumber,
  Call_Log.Caller_data_1 AS CallBackNumber,
  Call_Log.Caller_data_2 AS UserID,
  Call_Log.Caller_data_3 AS CallerData3,
  Call_Log.SERVER AS Server,
  Call_Log.APP AS APP,
  Call_Log.XFER_APP AS TransferApp,
  Call_Log.XFER_PEG AS TransferPeg,
  Call_Log.XFER_STATUS AS TransferStatus,
  Call_Log.ON_DUTY_FLAG AS OnDutyFlag,
  Call_Log.CALL_HANDLED AS CallHandled,
  Call_Log.TRANSFERRED AS Transferred,
  PEG_LOG.SEQ_NBR AS SequenceNumber,
From Call_Log

What I need to do is get any calllogcallID that went through Peg 1 (peg_log.Peg as peg) and then pull all of the data using those calllogids as a filter

So if call 1 went through peg 1 2 3 4 5 and call 2 went through peg 2 3 4 5 and call 3 went through 1 3 4 5 then I would get all of the data for call 1 and 3 but not for call 2.

I cannot just do a filter based on any call logs that went through peg 1 because I need the information stored in the additional columns for the other pegs that call went through.

This is really out of my comfort zone for SQL and I haven't been able to find a solution to this.

Based on the comment to @Clockwork-Muse to my other answer, I'll present my original approach.

Honestly, it does seem better, so I may delete my other answer. Though I'm curious, if you want to test both, and let us know if this approach was in fact faster?

select      CallLogCallID = cl.ivr_call_id,
            -- other call_log columns here

            SequenceNumber = pl.seq_nbr,
            -- other peg_log columns here

from        call_log cl
left join   peg_log pl on cl.ivr_call_id = pl.ivr_call_id
where       exists (
                select  0
                from    peg_log plSub
                where   cl.ivr_call_id = plSub.ivr_call_id
                and     plSub.seq_nbr = 1

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This uses a subquery in the join for peg=1. Is this what you're after?

Declare @Call_log Table
otherfield VarChar(50)
Insert Into @call_log Values

Declare @Peg_Log Table
Id Int,
peg Int
Insert Into @Peg_log Values

Select Distinct c.IVR_CALL_ID
   @Call_Log c Left join 
   (Select IVR_CALL_ID From @Peg_Log Where peg =1) x ON c.IVR_CALL_ID = x.IVR_CALL_ID

Result: (Remove Distinct to get other columns)


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  • Possible duplicate of Joining customers and tags table
  • I'm assuming that using PEG_LOG.PEG AS PEG, instead of seq_nbr would be the same logic? I will test it here in a few moments and see if this gets me what I need
  • This worked thanks! because I am using tableau and tableau does some funky stuff with sql I am not going to attempt your other response (using the with statement is funky).
  • ....this is an unusual way to do this query. If the percentage of rows with seq_nbr = 1 is small, query performance is likely to be poor (an index is unlikely to be helpful).
  • @Clockwork-Muse, would you propose an exists logic? I was starting off on that but took a turn towards CTE.
  • An EXISTS is the more usual form of this query, yes (the CTE-ness is irrelevant, as it can be done as a subquery as well). Especially as it more closely matches the intent of the question being asked.