Simple Select in Trigger is not supported.

Hi Experts,

I have executed the below query. But I am getting the error.

CREATE TRIGGER MYTRIG_SQLEXCEPTION

AFTER INSERT ON "SREE"."TARGET1"

BEGIN

     DECLARE EXIT HANDLER FOR SQLEXCEPTION SELECT ::SQL_ERROR_CODE, ::SQL_ERROR_MESSAGE FROM DUMMY;

     INSERT INTO "SREE"."MYTAB" VALUES (1);

     INSERT INTO "SREE"."MYTAB" VALUES (1);  -- expected unique violation error: 301

     -- not reached

END;

Error : feature not supported: simple select in trigger is not supported: line 4 col 44 (at pos 120)

Can anyone help me how to execute the trigger successfully