Question

以下代码给出了这个错误：

Msg 207，Level 16，State 1，Line 6
列名称无效＆＃39; AdvertisementsPrinted＆＃39;。

我需要应用AdvertisementsPrinted > 0，我该如何调整代码？

SELECT
    DATEPART(hh, DateCreated) AS Hour,
    AdvertisementId,
    COUNT(CASE WHEN IsPrinted = 1 THEN IsPrinted END) AS AdvertisementsPrinted
FROM 
    dbo.GaAnalytics
WHERE 
    AdvertisementId IS NOT NULL AND AdvertisementsPrinted > 0
GROUP BY
    DATEPART(hh, DateCreated),
    AdvertisementId
ORDER BY 
    AdvertisementsPrinted DESC

Answer 1

有两个问题：

WHERE AdvertisementId IS NOT NULL AND AdvertisementsPrinted > 0 - AdvertisementsPrinted是一个聚合，因此它应该在HAVING子句中。
除了SELECT之外，您不能在查询的任何其他子句中使用ORDER BY中的别名。这是因为SELECT是在WHERE或GROUP BY等其他条款之后进行评估的，而ORDER BY是最后一个条款。

因此，请将您的查询更改为：

SELECT
DATEPART(hh, DateCreated) as Hour,
AdvertisementId,
COUNT(case when IsPrinted = 1 then IsPrinted end) as AdvertisementsPrinted
FROM dbo.GaAnalytics
WHERE AdvertisementId IS NOT NULL
GROUP BY
DATEPART(hh, DateCreated),
AdvertisementId
HAVING COUNT(case when IsPrinted = 1 then IsPrinted end) > 0
ORDER BY AdvertisementsPrinted DESC

Answer 2

用COUNT替换AdvertisementsPrinted（IsPrinted = 1然后IsPrinted结束时的情况）

SELECT
DATEPART(hh, DateCreated) as Hour,
AdvertisementId,
COUNT(case when IsPrinted = 1 then IsPrinted end) as AdvertisementsPrinted
FROM dbo.GaAnalytics
WHERE AdvertisementId IS NOT NULL AND COUNT(case when IsPrinted = 1 then IsPrinted end)> 0
GROUP BY
DATEPART(hh, DateCreated),
AdvertisementId

错误：尝试过滤别名列名时无效的列名称

2 个答案: