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From: "Oliver Elphick" <olly(at)lfix(dot)co(dot)uk>
To: Murray Hobbs <murray(at)efone(dot)com>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: protected ON DELETE CASCADE
Date: 2001-08-23 13:01:51
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
Murray Hobbs wrote:
  >here's my problem
  >i have tables A, B, C, D
  >A <- B
  >A <- C <- D
  >i want to maintain integrity so that if A is deleted from then so is
  >anything referencing from B and C - no problem ON DELETE CASCADE
  >but if there are any D's that point back to A (through composite key in
  >C) i don't want the delete to go ahead - at all - i want an error
  >message and condition
If the reference from D to C uses ON DELETE RESTRICT (or NO ACTION), that
should fail and thus cause the original DELETE to fail.

Oliver Elphick                                Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight                    
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     "For God hath not appointed us to wrath, but to obtain 
      salvation by our Lord Jesus Christ, Who died for us, 
      that, whether we wake or sleep, we should live  
      together with him."     
                         I Thessalonians 5:9,10 


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Subject: Re: integrity and inherit
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