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Re: InstantDB: SQL query does not run


Hi Bill

thanks for looking at the code. Yes, I did not set the join to the table "vrnt".
(I had checked the query before against an informix sql server and it seemed to
be ok.) I have added the missing join. Surprisingly the query still does not run
or does not come to an end.

Regards
Thomas Vatter


Bill Karwin schrieb:

> Hi Thomas,
>
> One observation: this is a cartesian product, because there is no join
> condition that links vrnt with any other table.  So it might be
> generating a result set that is larger than what you intend.  If that
> results in a ridiculously large result set, it could be overwhelming the
> InstantDB engine.
>
> Have you considered testing simpler queries with fewer tables until you
> can build up the full 14-way join?
>
> Thomas Vatter wrote:
> > from
> >
> >      eintr, stf, mng, knz, gfh, rstkmb, gbd, stc, rm, fchabt,
> >      ins, arb, brb, vrnt
> >
> > where
> >
> >      dor is null and doa is null and unme <> "zxy" and
> >      eintr.stfn = stf.stfn and
> >      eintr.brbn = brb.brbn and
> >      eintr.fchabtn = fchabt.fchabtn and
> >      eintr.gbdn = gbd.gbdn and
> >      fchabt.insn = ins.insn and
> >      fchabt.arbn = arb.arbn and
> >      gbd.stcn = stc.stcn and
> >      gbd.rmn = rm.rmn and
> >      stf.gfhn = gfh.gfhn and
> >      stf.mngn = mng.mngn and
> >      stf.rstkmbn = rstkmb.rstkmbn and
> >      stf.knzn = knz.knzn
>
> Regards,
> Bill Karwin
> Application Architect - Lutris Technologies, Inc.
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