trigger for duplicate email id

• R.B.Verma

  SSC Enthusiast

  Points: 108

  More actions

  July 29, 2004 at 6:58 am

  #84989

  Write a trigger for checking duplicate email id whenever a new record is being inserted into table.However email column be null,but if is not null then no new email id is matched with previous emailid in the table

• Johan Bijnens

  SSC Guru

  Points: 134873

  More actions

  July 29, 2004 at 8:17 am

  #516792

  could be something like this :

  CREATE TRIGGER TrIU_T_Mytable ON dbo.Mytable

  FOR INSERT, UPDATE

  AS

     IF MyEmailColumn is NOT null

        begin

  -- must be unique where not null

    If exists (select * from dbo.Mytable T inner join inserted Ins where T.MyEmailColumn = Ins.MyEmailColumn)          begin

    raiserror("Duplicate Emailaddress", 12,1)

    rollback transaction

     end

   

        end

  GO

  test it test it test it

   

  Johan
  
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