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對於我在另一個SO用戶的幫助下開發的其他幾個SQL查詢，我使用了相同的格式。它奇妙地用於沒有太多行的表上，但是我現在正致力於使這個查詢與3個每行大約有65K行的表一起工作。查詢尚未完成（我讓它在後臺運行，而我處理其他事情，並在大約8小時後放棄）。幾分鐘後，相同的查詢將在大約20K行的表上運行。我已經嘗試在連接字段上的表上創建索引（包括具有多個字段的1個索引以及單獨的單個字段索引），但仍然沒有運氣。我想知道是否有其他方法可以優化此查詢，或者可能採取另一種方法來獲得類似的結果。如何加快MySQL Select Case查詢
SELECT a.PART_KIT_ID, `PART_KIT_NAME`,`EXTERNAL_SYS_PART_ID`, `ATA_NUMBER`, `PART_KIT_DESC`, `ACTIVE_IND`, `Flag NameA`, `Parameter Name`, `Flag NameB`, `AutoCAT`, `ICAM`, `ICAM_PRIOR`
from (SELECT b.PART_KIT_ID
, CASE WHEN b.CTLG_VER_ID <> c.CTLG_VER_ID and b.CTLG_VER_ID <> a.CTLG_VER_ID THEN 'CTLG VER ID FLAG A' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.CTLG_VER_ID = c.CTLG_VER_ID and b.CTLG_VER_ID <> a.CTLG_VER_ID THEN 'CTLG VER ID FLAG B' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'CTLG_VER_ID' `Parameter Name`
, a.CTLG_VER_ID `AutoCAT`
, b.CTLG_VER_ID `ICAM`
, c.CTLG_VER_ID `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.CTLG_NAME <> c.CTLG_NAME and b.CTLG_NAME <> a.CTLG_NAME THEN 'CTLG NAME FLAG A' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.CTLG_NAME = c.CTLG_NAME and b.CTLG_NAME <> a.CTLG_NAME THEN 'CTLG NAME FLAG B' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'CTLG_NAME' `Parameter Name`
, a.CTLG_NAME `AutoCAT`
, b.CTLG_NAME `ICAM`
, c.CTLG_NAME `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.PART_KIT_NAME <> c.PART_KIT_NAME and b.PART_KIT_NAME <> a.PART_KIT_NAME THEN 'PART KIT NAME FLAG A' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.PART_KIT_NAME = c.PART_KIT_NAME and b.PART_KIT_NAME <> a.PART_KIT_NAME THEN 'PART KIT NAME FLAG B' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'PART_KIT_NAME' `Parameter Name`
, a.PART_KIT_NAME `AutoCAT`
, b.PART_KIT_NAME `ICAM`
, c.PART_KIT_NAME `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.ATTRIB_ID <> c.ATTRIB_ID and b.ATTRIB_ID <> a.ATTRIB_ID THEN 'ATTRIB_ID FLAG A' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.ATTRIB_ID = b.ATTRIB_ID and b.ATTRIB_ID <> a.ATTRIB_ID THEN 'ATTRIB_ID ID FLAG B' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'ATTRIB_ID' `Parameter Name`
, a.ATTRIB_ID `AutoCAT`
, b.ATTRIB_ID `ICAM`
, c.ATTRIB_ID `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.ATTRIB_NAME <> c.ATTRIB_NAME and b.ATTRIB_NAME <> a.ATTRIB_NAME THEN 'ATTRIB_NAME FLAGA' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.ATTRIB_NAME = c.ATTRIB_NAME and b.ATTRIB_NAME <> a.ATTRIB_NAME THEN 'ATTRIB_NAME FLAGB' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'ATTRIB_NAME' `Parameter Name`
, a.ATTRIB_NAME `AutoCAT`
, b.ATTRIB_NAME `ICAM`
, c.ATTRIB_NAME `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.ATTRIB_DESC <> c.ATTRIB_DESC and b.ATTRIB_DESC <> a.ATTRIB_DESC THEN 'ATTRIB_DESC FLAGA' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.ATTRIB_DESC = c.ATTRIB_DESC and b.ATTRIB_DESC <> a.ATTRIB_DESC THEN 'ATTRIB_DESC FLAGB' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'ATTRIB_DESC' `Parameter Name`
, a.ATTRIB_DESC `AutoCAT`
, b.ATTRIB_DESC `ICAM`
, c.ATTRIB_DESC `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.ATTRIB_VALUE <> c.ATTRIB_VALUE and b.ATTRIB_VALUE <> a.ATTRIB_VALUE THEN 'ATTRIB_VALUE FLAGA' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.ATTRIB_VALUE = c.ATTRIB_VALUE and b.ATTRIB_VALUE <> a.ATTRIB_VALUE THEN 'ATTRIB_VALUE FLAGB' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'ATTRIB_VALUE' `Parameter Name`
, a.ATTRIB_VALUE `AutoCAT`
, b.ATTRIB_VALUE `ICAM`
, c.ATTRIB_VALUE `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.EXTERNAL_SYS_PART_ID <> c.EXTERNAL_SYS_PART_ID and b.EXTERNAL_SYS_PART_ID <> a.EXTERNAL_SYS_PART_ID THEN 'EXTERNAL_SYS_PART_ID FLAGA' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and b.EXTERNAL_SYS_PART_ID <> a.EXTERNAL_SYS_PART_ID THEN 'EXTERNAL_SYS_PART_ID FLAGB' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'EXTERNAL_SYS_PART_ID' `Parameter Name`
, a.EXTERNAL_SYS_PART_ID `AutoCAT`
, b.EXTERNAL_SYS_PART_ID `ICAM`
, c.EXTERNAL_SYS_PART_ID `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
UNION ALL
SELECT b.PART_KIT_ID
, CASE WHEN b.PART_KIT_ID <> c.PART_KIT_ID and b.PART_KIT_ID <> a.PART_KIT_ID THEN 'PART_KIT_ID FLAGA' ELSE NULL END AS `Flag NameA`
, CASE WHEN b.PART_KIT_ID = c.PART_KIT_ID and b.PART_KIT_ID <> a.PART_KIT_ID THEN 'PART_KIT_ID FLAGB' ELSE NULL END AS `Flag NameB`
, a.PART_KIT_NAME `PART_KIT_NAME`
, d.ATA_NUMBER `ATA_NUMBER`
, d.EXTERNAL_SYS_PART_ID `EXTERNAL_SYS_PART_ID`
, d.PART_KIT_DESC `PART_KIT_DESC`
, d.ACTIVE_IND `ACTIVE_IND`
, 'PART_KIT_ID' `Parameter Name`
, a.PART_KIT_ID `AutoCAT`
, b.PART_KIT_ID `ICAM`
, c.PART_KIT_ID `ICAM_PRIOR`
FROM cost_part_kit_attrib_ctlg_pq_acat a
JOIN cost_part_kit_attrib_ctlg_pq_icam b ON a.EXTERNAL_SYS_PART_ID = b.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = b.ATTRIB_ID
JOIN cost_part_kit_attrib_ctlg_pq_icam_prior c on a.EXTERNAL_SYS_PART_ID = c.EXTERNAL_SYS_PART_ID and a.ATTRIB_ID = c.ATTRIB_ID
LEFT OUTER JOIN acat_attribute d on a.ACAT_PART_KIT_ID = d.AUTOCAT_PART_KIT_ID
) a
ORDER BY PART_KIT_ID
最初我曾想過使用Unpivot，但由於我將要使用的字段數量而被告知。愛建議/建議frormthe專家！
如果沒有正確的DDL和解釋，我們無法真正提供幫助 – Strawberry