Question

我正在努力获得“活跃产品系列”的计数（*）总和。 2个日期之间。这是我的一点。

我想总结一下“产品线”的活跃程度＆＃39;柱。我遗漏了其他Where子句来简化这个问题。

SELECT mfr_id as 'Manufacturer ID', COUNT(*) AS 'Product lines Active'
FROM database.LabReport 
Where (rpt_upload_dt BETWEEN '2012-01-01' and '2012-12-31' ) 
GROUP BY mfr_id  
Order by mfr_id

Answer 1

尝试使用子查询。它的一个解决方案可能不是最好的。

SELECT SUM(Product lines Active) AS 'sum'
FROM
    (SELECT mfr_id as 'Manufacturer ID', COUNT(*) AS 'Product lines Active'
    FROM database.LabReport 
    Where (rpt_upload_dt BETWEEN '2012-01-01' and '2012-12-31' ) 
    GROUP BY mfr_id) AS x

Answer 2

正如鲍比所指出的，这是最简单的解决方案：

SELECT COUNT（*）AS＆＃39;产品系列有效＆＃39;

FROM database.LabReport 哪里（rpt_upload_dt BETWEEN＆＃39; 2012-01-01＆＃39;和＆＃39; 2012-12-31＆＃39;）

Answer 3

您将无法在另一个函数之上使用聚合函数..

试试这个..

WITH CTE AS (
SELECT mfr_id as 'Manufacturer ID', COUNT(*) AS Product_lines_Active
FROM database.LabReport 
Where (rpt_upload_dt BETWEEN '2012-01-01' and '2012-12-31' ) 
GROUP BY mfr_id  
)
SELECT SUM(Product_lines_Active)
FROM CTE

OR 直接使用聚合

SELECT COUNT(*) AS Product_lines_Active
FROM database.LabReport 
Where (rpt_upload_dt BETWEEN '2012-01-01' and '2012-12-31' )

求和计数（*）列

3 个答案: