SELECT DISTINCT sql_id, plan_hash_value

FROM dba_hist_sqlstat dhs,

    (

    SELECT /*+ NO_MERGE */ MIN(snap_id) min_snap, MAX(snap_id) max_snap

    FROM dba_hist_snapshot ss

    WHERE ss.begin_interval_time BETWEEN (SYSDATE - 4) AND SYSDATE

    ) s

WHERE dhs.snap_id BETWEEN s.min_snap AND s.max_snap

  AND dhs.sql_id IN ('my_sql_id');

EXPLAIN PLAN SET STATEMENT_ID = 'TEST1' FOR

SELECT * FROM dual CONNECT BY level <= 10;

-- Displays plan

SELECT *

FROM TABLE (dbms_xplan.display);

-- Getting hash_plan_value from explain plan

SELECT extractValue(xmltype(other_xml), 

       '/other_xml/info[@type="plan_hash"]') AS plan_hash

FROM plan_table

WHERE other_xml IS NOT NULL

  AND statement_id = 'TEST1';