Question

我找不到可以在查询中放置WHERE子句的位置。似乎我尝试了所有可能的位置，但没有任何工作。

SELECT res
FROM (
SELECT `date`,SUM(DISTRIBUTED_AMOUNT / EXCHANGE_RATE) AS res
FROM royalties 
GROUP BY `date`
ORDER BY `date` DESC LIMIT 12
) a
ORDER BY `date` ASC
WHERE `BUNDLE_ARTIST` = '" . $artist_name . "'

Answer 1

我原以为你需要把它放在子查询中的FROM子句之后：

SELECT res
FROM (
SELECT `date`,SUM(DISTRIBUTED_AMOUNT / EXCHANGE_RATE) AS res
FROM royalties 
WHERE `BUNDLE_ARTIST` = '" . $artist_name . "'
GROUP BY `date`
ORDER BY `date` DESC LIMIT 12
) a
ORDER BY `date` ASC

您可以在the MySQL manual中看到此订单。

Answer 2

您似乎在子句中使用内部查询。你犯了一些错误。试试这个：

SELECT res
FROM 
(
    SELECT `date`,SUM(DISTRIBUTED_AMOUNT / EXCHANGE_RATE) AS res
    FROM royalties 
    WHERE `BUNDLE_ARTIST` = '" . $artist_name . "'
    GROUP BY `date`
    ORDER BY `date` DESC LIMIT 12
) inner query
ORDER BY `date` ASC

Answer 3

通常，我发现在ORDER和GROUP子句最好之前包括你的WHERE子句：

SELECT res
FROM (
SELECT `date`,SUM(DISTRIBUTED_AMOUNT / EXCHANGE_RATE) AS res
FROM royalties 
GROUP BY `date`
ORDER BY `date` DESC LIMIT 12
)
WHERE `BUNDLE_ARTIST` = '" . $artist_name . "'
ORDER BY `date` ASC

在mysql查询中放置WHERE的位置

3 个答案: