T-SQL-在單個查詢中包含計數（*）的總和

Question

使用表I和字段date_entered和代碼，我編寫了一個查詢來列出代碼='12A'的每一年的計數。

select distinct year(date_entered) as Yr, count(*) as Cnt 
from i 
where code = '12A' 
group by year(date_entered) 
order by Yr desc 

這將產生：

Yr | Cnt 
2011 | 780 
2010 | 3489 
2009 | 3256 
... 

我想包括在我的結果集的CNT變量的總和。我知道如何使用單獨的查詢來查找總和，但我想在我的原始查詢中計算總和。

Answer 1

添加WITH ROLLUP到查詢GROUP BY條款後，你會得到一個額外的一行包含空YR您最終總數。

select year(date_entered) as Yr, count(*) as Cnt 
from i 
where code = '12A' 
group by year(date_entered) 
with rollup 
order by Yr desc 

Answer 2

創建一個子查詢，幷包括在主查詢的結果

select 
     year(date_entered) as Yr, 
     count(*) as Cnt, 
     t.MySum 
from 
     i  
INNER JOIN (
      SELECT 
        SUM(MyColumn) as MySum 
      FROM 
        i     
      WHERE 
        code='12A' 
      ) t 
ON 
     t.ID = MyTable.ID 
where 
     code = '12A' 
group by 
     year(date_entered) 
order by 
     Yr desc 

Answer 3

;WITH cte 
    AS (SELECT YEAR(date_entered) AS yr, 
       COUNT(*)   AS cnt 
     FROM i 
     WHERE code = '12A' 
     GROUP BY YEAR(date_entered)) 
SELECT yr, 
     cnt, 
     SUM(cnt) OVER() AS totcnt 
FROM cte 
ORDER BY yr DESC