<p>Hello,<p>I want to create a trigger in PostgresSQL <p><span class="921122105-18112005">In trigger, Before inserting
therecord, if data is already in the table, the trigger fire the mesaage that data is already there, and after that
triggerckeck for next insert statement.</span><p><span class="921122105-18112005"></span><span
class="921122105-18112005">Howcan I do this , </span>Please reply.<p>Regards, <p>_____ <p>Aftab Alam
