[英]how to select max value with corresponding id in mysql
SELECT
id
, insId
, MAX(avgRating) as avgRating
FROM reviews
WHERE status='1'
GROUP BY insId
此查詢返回按insId分組的所有評論,但id不與此對應。
您需要使用自已的INNER JOIN來獲得所需的結果。
SELECT
reviews.id
, reviews_max.insId
, reviews_max.maxAvgRating
FROM (
SELECT
insId
, MAX(avgRating) AS maxAvgRating
FROM
reviews
WHERE
status = '1'
GROUP BY
insId
) AS reviews_max
INNER JOIN
reviews
ON
reviews.insId = reviews_max.insId
AND
reviews.avgRating = reviews_max.maxAvgRating
嘗試這個:
SELECT
id
, insId
, MAX(avgRating) as avgRating
FROM reviews
WHERE status='1'
GROUP BY id
您可以嘗試以下方法:
SELECT id,
insId,
MAX(avgRating) as avgRating
FROM reviews
WHERE status='1'
GROUP BY id, insId
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