sql - MS Access Data Structure Problems with Parent/Child self-joins -


i have database following tables:

  • beliefst

    • beliefid (autonumber)
    • belief (short text)

  • reasonstoagreet

    • argagreeid (autonumber)
    • conclusionaid(lookup beliefst)
    • reasontoagreeid (also lookup beliefst)

  • reasonstodisagreet

    • argdisagreeid (autonumber)
    • conclusiondid (also lookup beliefst)
    • reasontodisagreeid (also lookup beliefst)

problem 1: can't count number of times conclusionaid has been selected in reasonstoagreet table.

this first attempt:

select beliefst.belief, reasonstoagreet.reasontoagreeid, reasonstodisagreet.reasontodisagreeid (beliefst           left join reasonstoagreet              on beliefst.beliefid = reasonstoagreet.conclusionaid       ) left join reasonstodisagreet              on beliefst.beliefid = reasonstodisagreet.conclusiondid group beliefst.belief, reasonstoagreet.reasontoagreeid, reasonstodisagreet.reasontodisagreeid order beliefst.belief;

it sort of lets @ values, doesn't anything...

i can @ 1 table @ time, doesn't me anything:

select reasonstoagreet.conclusionaid, count(reasonstoagreet.reasontoagreeid) countofreasontoagreeid reasonstoagreet group reasonstoagreet.conclusionaid;

this closesest can get, report data source, counts duplicate empty values, because relationships messed up:

select beliefst.belief, reasonstoagreet.reasontoagreeid, reasonstodisagreet.reasontodisagreeid (beliefst          left join reasonstoagreet            on beliefst.beliefid = reasonstoagreet.conclusionaid       ) left join reasonstodisagreet            on beliefst.beliefid = reasonstodisagreet.conclusiondid;

when include both reasons agree table , reasons disagree table, relationships messed up, because both @ same belief table, , tries cross product, , gets messed up, , can't accurately count number of reasons agree or disagree...

your business logic , problem definition bit unclear, based on qualified guess, best possible sql query solution came out following:

select beliefst.belief, reasonstoagreet.reasontoagreeid, reasonstodisagreet.reasontodisagreeid (beliefst left join reasonstoagreet on beliefst.beliefid = reasonstoagreet.conclusionaid) left join reasonstodisagreet on beliefst.beliefid = reasonstodisagreet.conclusiondid;

if problem null values erroneously counted, add where clause not null referring respective fields. option use ms access sql conditional operator iif(isnull(somefield), 0, 1).

hope may help. best regards,


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