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我在另一个 SO 用户的帮助下开发的其他几个 SQL 查询也使用了相同的格式。它在没有太多行的表上运行得非常好,但我现在正在努力让这个查询与 3 个表一起使用,每个表大约有 65K 行。该查询尚未完成运行(当我处理其他事情时,我让它在后台运行,并在大约 8 小时后放弃)。对于大约 20K 行的表,相同的查询只需几分钟即可运行。我尝试在表的连接字段上创建索引(1 个具有多个字段的索引,以及单独的单字段索引),但仍然没有成功。我想知道是否有其他方法可以优化此查询,或者我可以采取另一种方法来获得类似的结果。
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
最初我曾考虑使用 Unpivot,但由于我要处理的字段数量较多,因此被建议不要这样做。希望得到专家的意见/建议!
最佳答案
因此,我花了一些时间查看我的连接,试图确保它们确实有意义 - 然后我意识到我的左外连接正在连接一个字段,而该字段的意义不如另一个字段。我的查询现在运行时间为 1 分 16 秒!
关于mysql - 如何加快 MySQL Select Case 查询速度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33810684/
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