可以優化這段SQL嗎?
CREATE OR REPLACE MATERIALIZED View gdw-dev-roc2.fab_11_roc.right_person_all_micron_user_v
AS
SELECT  a.* from (
SELECT  TRIM(SW.cost_center_code) AS cost_center_code
       ,SW.company_no
       ,SWD.org_unit
       ,lower(TRIM(SW.micron_username)) AS username
       ,SW.worker_no
       ,SW.legal_first_name
       ,SW.micron_supvr_flag
       ,SW.position_desc AS position_desc
       ,CASE WHEN SJ.job_long_txt like '%MANAGER 1' THEN 1
             WHEN SJ.job_long_txt like '%MANAGER 2' THEN 2
             WHEN SJ.job_long_txt like '%MANAGER 3' THEN 3
             WHEN SJ.job_long_txt like '%MANAGER 4' THEN 4
             WHEN SJ.job_long_txt like '%M4' THEN 4  ELSE null END AS org_level
       ,SW.work_shift_code
       ,lower(TRIM(SSW.micron_username)) AS supervisor
       ,lower(TRIM(SSSW.micron_username)) AS supervisor2
       ,SSW.micron_supvr_flag AS micron_supvr_flag2
       ,SSW.position_desc AS position_desc2
       ,SSW.worker_no AS worker_no2
       ,CASE WHEN SSJ.job_long_txt like '%MANAGER 1' THEN 1
             WHEN SSJ.job_long_txt like '%MANAGER 2' THEN 2
             WHEN SSJ.job_long_txt like '%MANAGER 3' THEN 3
             WHEN SSJ.job_long_txt like '%MANAGER 4' THEN 4
             WHEN SSJ.job_long_txt like '%M4' THEN 4
             WHEN SSJ.job_long_txt like '%CVP' THEN 9  ELSE null END   AS org_level2
       ,lower(TRIM(SSSSW.micron_username)) AS supervisor3
       ,SSSW.micron_supvr_flag AS micron_supvr_flag3
       ,SSSW.position_desc AS position_desc3
       ,SSSW.worker_no AS worker_no3
       ,CASE WHEN SSSJ.job_long_txt like '%MANAGER 1' THEN 1
             WHEN SSSJ.job_long_txt like '%MANAGER 2' THEN 2
             WHEN SSSJ.job_long_txt like '%MANAGER 3' THEN 3
             WHEN SSSJ.job_long_txt like '%MANAGER 4' THEN 4
             WHEN SSSJ.job_long_txt like '%M4' THEN 4
             WHEN SSSJ.job_long_txt like '%CVP' THEN 9  ELSE null END  AS org_level3
       ,SSSSW.micron_supvr_flag AS micron_supvr_flag4
       ,SSSSW.position_desc AS position_desc4
       ,SSSSW.worker_no AS worker_no4
       ,CASE WHEN SSSSJ.job_long_txt like '%MANAGER 1' THEN 1
             WHEN SSSSJ.job_long_txt like '%MANAGER 2' THEN 2
             WHEN SSSSJ.job_long_txt like '%MANAGER 3' THEN 3
             WHEN SSSSJ.job_long_txt like '%MANAGER 4' THEN 4
             WHEN SSSSJ.job_long_txt like '%M4' THEN 4
             WHEN SSSSJ.job_long_txt like '%CVP' THEN 9  ELSE null END AS org_level4
FROM gdw-prod-data.fab_10_ref.SAP_worker_data_v SWD 
INNER JOIN gdw-prod-data.fab_10_ref.SAP_worker