Drop a sql baseline - oracle database script

DECLARE drop_result pls_integer;

BEGIN drop_result := DBMS_SPM.DROP_SQL_PLAN_BASELINE(plan_name => '&sql_plan_baseline_name');

dbms_output.put_line(drop_result);

END;

/ You can GET the SQL baseline
FROM a sql_id
FROM below command:
SELECT sql_handle,
       plan_name
FROM dba_sql_plan_baselines
WHERE signature IN
    (SELECT exact_matching_signature
     FROM gv$sql
     WHERE sql_id='&SQL_ID');