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Help doing query on only records from another query

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    Help doing query on only records from another query

    I have the following code on the oninit event for a lookup form. There are over 140,000 records in the table. The query is using LQO and responds immediately. The issue is that I need to add two more conditions to the query for the records I want to display. When I add those options to the query command then I loose LQO and it takes 7 seconds to load. Is there a way to run a second query against only the few records that are returned from the first query and display only those records on my lookup form with an embedded browse.

    vRecords = topparent.queryrun("between(Lookupkey,\""+gLookupKey+"\",\""+vLookupKeyEnd+"\")","Lookupkey","","No","<Cross Level>",.f.)
    Secondary conditions:
    (Store=Var->gINstore) .and. if(Var->vInactive,.t.,.not. Initem->Inactive)
    Jeff Ryder

    Re: Help doing query on only records from another query


    A couple of thoughts......

    It looks like this - if(Var->vInactive,.t.,.not. Initem->Inactive) - is querying a child table. If so that may be the cause of the extra time. Not sure if anything can be done there.

    The same snippet - if(Var->vInactive,.t.,.not. Initem->Inactive) - Since this statement is embedded directly in the filter the 'IF' test needs to be evaluated for each record. And similarly, the (Store=Var->gINstore) needs to evalute the variable each record.

    I usually try to pass the filter with as much of the final values as possible. If the filter is conditional as you have then construct the filter conditionally before giving it to the query function.

    Here is an example.
    dim gLookupKey as C = "11111111"
    dim vLookupKeyEnd as C = "9999999"
    dim gINstore as C = "SomeStore"
    dim vInactive as L = .f.
    if vInactive then
       [COLOR=Blue] 'when vInactive is true This - if(Var->vInactive,.t.,.not. Initem->Inactive) - results in '.t.' which means
        'all records which means you don't need to filter in this case.[/COLOR]
        Filter = "between(Lookupkey,\""+gLookupKey+"\",\""+vLookupKeyEnd+"\") .and. Store = \"" + gINstore + "\""
        [COLOR=Blue]'Add the filter to eliminate the inactive records.[/COLOR]
        Filter = "between(Lookupkey,\""+gLookupKey+"\",\""+vLookupKeyEnd+"\") .and. Store = \"" + gINstore + "\" .and. (.not. Initem->Inactive)"
    end if
    'vRecords = topparent.queryrun(filter,"Lookupkey","","No","<Cross Level>",.f.)
    Tim Kiebert
    Eagle Creek Citrus
    A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


      Re: Help doing query on only records from another query


      Thank you for the great suggestions and I will keep those in mind. My real issue is when I am doing an partial item lookup through 140,000 records there is a major difference between LQO finding 20 or so records in an instant and running a regular query through 144,000 which takes about 7 seconds even if I eliminate the condition of inactive which as you have pointed out is in a child record.

      What I really want to do is run a LQO using the between start /stop option to get me down to 20 or less records from a table of 140,000 and then run a second query against those 20 or so records to eliminate the records I do not want and then display the resultant records in an embedded browse.

      I am surprised that I can not find a way to run a second query to narrow down the results of a query instead of only being able to run a query against a full table.
      Jeff Ryder


        Re: Help doing query on only records from another query

        You could use your first query in a copy operation creating a temp table and then query the temp table further.
        There can be only one.


          Re: Help doing query on only records from another query

          Thanks Stan I will give that a try. If I come up with a different solution I will report back here.
          Jeff Ryder