Sql 错误：尝试筛选别名列名时列名无效

以下代码给出了此错误：

味精207，16级，状态1，第6行
无效的列名“AdvertisementSprint”

我需要应用

广告sprint>0

，如何调整我的代码

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

---

替换按计数冲刺的广告（如果IsPrinted=1，则为IsPrinted end）

有两个问题：

其中，AdvertisementId不为NULL且AdvertisementsPrinted>0

-

AdvertisementsPrinted

是一个聚合，因此它应该位于

HAVING

子句中

您不能在查询的任何其他子句中使用

SELECT

中的别名，除非

ORDER BY

。这是因为

SELECT

是在其他子句（如

WHERE

或

groupby

）之后计算的，而

ORDER BY

是最后一个子句

因此，请将查询更改为：

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

---

有广告冲刺>0@demas感谢您的介绍，但如果我在ORDER BY之前添加HAVING AdvertisementSprint>0，则我得到相同的错误它不起作用，我得到错误聚合可能不会出现在WHERE子句中，除非它位于HAVING子句或select列表中包含的子查询中，正在聚合的列是外部引用。感谢您的明确解释。

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