[英]SQL sum and divide by number of results
無法正常工作...這是我到目前為止的結果:
SELECT CardCode, (sum(DocRate) DocRate/DocRate.Length)
FROM OPCH
WHERE DocRate > 1
AND DocStatus = 'O'
AND DocDate >= '20140101'
GROUP BY CardCode
嘗試獲取DocRate的總和(每行各不相同),然后將其除以行數(以獲取平均值)。
這不起作用。
好容易,找到了解決方案。
使用AVG()
。
我的代碼:
SELECT CardCode,
avg(DocRate) DocRate
FROM OPCH
WHERE DocRate > 1
AND DocStatus = 'O'
AND DocDate >= '20140101'
GROUP BY CardCode
嘗試使用子查詢。
SELECT CardCode, (DocRate/length)
FROM
(SELECT CardCode,sum(DocRate) DocRate, sum (DocRate.Length) length
FROM OPCH
WHERE DocRate > 1
AND DocStatus = 'O'
AND DocDate >= '20140101'
GROUP BY CardCode) doc
GROUP BY CardCode
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