Use trigger to insert into table if data is not already present?

You don't need to requery the table from a row-level trigger. That's what the :NEW syntax is for, e.g.

You don't need to requery the table from a row-level trigger. That's what the :NEW. Syntax is for, e.g. : INSERT INTO t3(name1,name2,num1,num2) select :NEW.

Name1,:NEW. Name2,:NEW. Num1,:NEW.

Num2 from DUAL minus select name1,name2,num1,num2 from t3; Although I think the above code looks a bit silly. I'd prefer to put a unique constraint on t3 then add a handler in the trigger to take care of any DUP_VAL_ON_INDEX exceptions.

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