trigger --update (Incorrect value)

• mark00189

  SSC Enthusiast

  Points: 140

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  May 13, 2003 at 2:39 pm

  #80222

  guys,

  have 2 tbls (1-M) relationship.

  tblContact [PK contId(int 4), Name, MemoCount(int 4)]

  tblMemo[pk memoId (int 4), {FK} contId(int 4), memo (varchar 100)]

  I need to Write a trigger to automatically update the MemoCount field in the tblContact whenever a memo is inserted, updated or deleted. Assuming that the memoCount does not have the corect value, how would u write update trigger for that.

  thanks

  Edited by - mark00189 on 05/13/2003 2:40:59 PM

• dgermundson

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  May 13, 2003 at 9:45 pm

  #457061

  I would think you would only change a count on insert or delete so here it is:

  CREATE TRIGGER trgMemoCnt

  ON tblMemo

  FOR INSERT, DELETE

  AS

  if exists (select * from deleted)

  begin

  update tblContact set memocount = select (memocount - 1) from tblcontact

  end

  if exists (select * from inserted)

  begin

  update tblcontact set memocount = select (memocount + 1) from tblcontact

  end

  Darren

  
  Darren