Question

任何人都可以看看如何优化此查询。相同的复杂查询多次合并，并且UNION ALL的“最后更新日期”条件在每个集合中都不相同。我可以通过添加一个条件而不重复相同的查询来缩短下面的查询，这将给出相同的结果但是查询的运行时间长了10倍

(
AND dist_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
    OR line_locations_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
       OR line_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
          OR head_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
             OR releases_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') )

查询如下：

SELECT
    *
FROM
   table 1.. table 8
 WHERE

      dist_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
 /*all join conditions here */

 UNION ALL
 SELECT
     *
 FROM
    table 1.. table 8
 WHERE
      dist_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND line_locations_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     /*all join conditions here */
 UNION ALL
 SELECT
     *
 FROM
     table 1.. table 8
 WHERE

     dist_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND line_locations_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND line_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
 /*all join conditions here */
 UNION ALL
 SELECT
     *
 FROM
    table 1.. table 8
 WHERE
      dist_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND line_locations_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND line_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
     AND head_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
  /*all join conditions here */    
 SELECT
     *
 FROM
    table 1.. table 8
WHERE
    dist_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
    AND line_locations_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
        AND line_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
            AND head_all.last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
                AND releases_all.last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')
 /*all join conditions here */

Answer 1

尝试一下

WITH DTL AS
(
    SELECT da.last_update_date as da_last_update_date,
            lla.last_update_date as lla_last_update_date,
            line_all.last_update_date as la_last_update_date,
            head_all.last_update_date as ha_last_update_date,
            releases_all.last_update_date as ra_last_update_date,
            .......
    FROM head_all ha
            INNER JOIN dist_all da on (ha.header_id = da.header_id)
            INNER JOIN line_all la on (da.line_id = la.line_id )
            INNER JOIN line_locations_all lla on (da.line_location_id = lla.line_location_id )
            LEFT JOIN req_distributions_all rda on (rda.distribution_id = da.req_distribution_id)
            LEFT JOIN requisition_lines_all rla on (rda.requisition_line_id = rla.requisition_line_id) 
            LEFT JOIN requisition_headers_all rha on (rla.requisition_header_id = rha.requisition_header_id)
            LET JOIN releases_all ra on (lla.release_id = ra.release_id) 
            LEFT JOIN head_all contract on (la.contract_num = contract.segment1) 
            LEFT JOIN head_all blanket_agreement on (la.from_header_id = blanket_agreement.header_id)
            LEFT JOIN line_types_b ltb on (lla.line_id = ltb.line_type_id)
    WHERE line_locations_all.shipment_type NOT IN ( 'PRICE BREAK', 'PLANNED' ) 
    AND head_all.type_lookup_code IN ( 'BLANKET', 'STANDARD', 'PLANNED' ) 
)
Select * from dtl
Where da_last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
UNION ALL 
SELECT * from dtl
Where da_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND lla_last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
UNION ALL 
SELECT * From dtl
Where da_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND lla_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND la_last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
UNION ALL 
SELECT * From dtl
Where da_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND lla_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND la_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND ha_last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
UNION ALL 
SELECT * From dtl
WHERE da_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND lla_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND la_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND ha_last_update_date <= TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS') 
AND ra_last_update_date > TO_DATE('07/01/2018 00:00:01','MM/DD/YYYY HH24:MI:SS')

注意：在with子句中，所有其他必填列都应使用适当的别名来列出（这就是我放置....的原因）

优化联合所有查询oracle 11G？

1 个答案: