[英]MySQL group rows with same ID in one row
我嘗試在MySQL中做類似樞軸的操作,但是我被卡住了。
我有一張看起來像這樣的桌子:
我從以下查詢開始:
SELECT distinct
p.id, p.uuid, p.kpiDate, p.kpiTime,
CASE
WHEN p.subSysName = 'CMONE' THEN p.status
ELSE ''
END AS CMONE,
CASE
WHEN p.subSysName = 'DISODAY' THEN p.status
ELSE ''
END AS DISODAY,
CASE
WHEN p.subSysName = 'DIIN_HFFF' THEN p.status
ELSE ''
END AS DIIN_HFFF,
CASE
WHEN p.subSysName = 'DIIN_PAL' THEN p.status
ELSE ''
END AS DIIN_PAL,
CASE
WHEN p.subSysName = 'DISO_FAL' THEN p.status
ELSE ''
END AS DISO_FAL,
CASE
WHEN p.subSysName = 'MBATCH' THEN p.status
ELSE ''
END AS MBATCH,
CASE
WHEN p.subSysName = 'MO_BATCH' THEN p.status
ELSE ''
END AS MO_BATCH,
CASE
WHEN p.subSysName = 'QINTER' THEN p.status
ELSE ''
END AS QINTER,
CASE
WHEN p.subSysName = 'ZFIREWALL' THEN p.status
ELSE ''
END AS ZFIREWALL
FROM subsys_stat p
order by p.kpiDate, p.kpiTime
該查詢的結果如下所示:
因此,我設法將每個subSysName都放置為列。
下一步應該是,每個具有相同UUID的條目也位於同一行中,如下所示:
我怎樣才能做到這一點? 我以為我可以通過聯接(JOIN subsys_stat b ON ap.uuid = b.uuid)來做到這一點,但這不起作用。
您需要將分組添加到查詢中:
SELECT MIN(p.id), p.uuid, p.kpiDate, p.kpiTime,
MAX(CASE WHEN p.subSysName = 'CMONE' THEN p.status END) AS CMONE,
MAX(CASE WHEN p.subSysName = 'DISODAY' THEN p.status END) AS DISODAY,
... etc
FROM subsys_stat p
GROUP BY p.uuid, p.kpiDate, p.kpiTime
ORDER BY p.kpiDate, p.kpiTime
另外, CASE
表達式應在MAX
類的聚合函數中使用。
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