T-sql中的簡單SUM

Question

這應該很簡單。我正在使用SSMS 2008，試圖獲得只有一列的總和。問題是我目前在這一列上進行分組，並使用HAVING語句。我如何獲得總記錄數> 1的總和？這是我目前的T-SQL邏輯：

select count(*) as consumer_count from #consumer_initiations 
group by consumer 
having count(1) > 1 

但這個數據是這樣的：

consumer_count 
---------------- 
2 
2 
4 
3 
... 

Answer 1

總結呢？

SELECT SUM(consumer_count) 
FROM (
    select count(*) as consumer_count from #consumer_initiations 
    group by consumer 
    having count(1) > 1 
) AS whatever 

Answer 2

隨着嵌套查詢：

select sum(consumer_count) 
FROM (

    select count(*) as consumer_count from #consumer_initiations 
    group by consumer 
    having count(1) > 1 
) as child 

Answer 3

select sum(t.consumer_count) 
    from (select count(*) as consumer_count 
       from #consumer_initiations 
       group by consumer 
       having count(1) > 1) t 

Answer 4

嘗試：

select sum(t.consumer_count) from 
(
    select count(*) as consumer_count from #consumer_initiations 
    group by consumer 
    having count(1) > 1 
) t 

這會給你的紀錄，你原來的查詢返回的總和。這些類型的查詢稱爲嵌套查詢。

Answer 5

除了在另一個查詢包裹，你可以這樣做：

SELECT COUNT(*) AS consumer_count 
FROM #consumer_initiations AS a 
WHERE EXISTS 
     (SELECT * 
     FROM #consumer_initiations AS b 
     WHERE b.consumer = a.consumer 
      AND b.PK <> a.PK    -- the Primary Key of the table 
    )