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9.0

Need to write Complicated SQL Update Query in Informix

Asked by seahawk9 in Informix Database, MS SQL Server, DB2 Database

I am trying to write a complicated SQL update query (at least it's complicated to me, probably simple to others). I need to update table a (adm_rec) with the data from table s (sch_rec). But a isn't joined directly with s, I have to join them via table e (ed_rec).

So here is the select SQL:
select a.id, a.yr, a.cid, a.cinit, s.cid, s.cinit
from adm_rec a, ed_rec e, sch_rec s
where e.id = a.id
and e.sch_id = s.id
and a.cinit is null
and a.cid =0
and a.yr > 2008
and s.cinit is not null

a.id a.yr a.cid a.cinit s.cid s.cinit
50124514      2009      0      <null>      50059459      EJP
50104113      2009      0      <null>      50085862      JME
50105741      2009      0      <null>      50010855      AR
50106390      2009      0      <null>      50071301      DLI

So I want to put the value of s.cid into a.cid and the value of s.cinit into a.cinit.

Please help asap, all of my attempts give me a syntax error. I am new to informix. What I think should work is this:

update adm_rec
set cnslr_init = (select s.cinit
from adm_rec a, ed_rec e, sch_rec s
where e.id = a.id
and e.sch_id = s.id
and a.cinit is null
and a.cid =0
and a.yr > 2008
and s.cinit is not null)
where ed_rec.id = adm_rec.id
and ed_rec.sch_id = sch_rec.id
and adm_rec.cinit is null
and adm_rec.cid =0
and adm_rec.yr > 2008
and sch_rec.cinit is not nullStart Free Trial

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Need to write Complicated SQL Update Query in Informix

Asked by seahawk9 in Informix Database, MS SQL Server, DB2 Database

About this solution