如何統計每天的記錄數？

Question

我有一個表結構如下：

CustID --- DateAdded --- 

396  2012-02-09 
396  2012-02-09 
396  2012-02-08 
396  2012-02-07 
396  2012-02-07 
396  2012-02-07 
396  2012-02-06 
396  2012-02-06 

我想知道我怎麼能算的，每天記錄的數目，在過去的7天SQL，然後返回這是一個整數。

目前我有以下SQL查詢寫成：

SELECT * 
    FROM Responses 
WHERE DateAdded >= dateadd(day, datediff(day, 0, GetDate()) - 7, 0) 

RETURN 

然而，這只是返回過去7天的所有條目。如何計算過去7天內的每日記錄？

Answer 1

select DateAdded, count(CustID) 
from Responses 
WHERE DateAdded >=dateadd(day,datediff(day,0,GetDate())- 7,0) 
GROUP BY DateAdded 

Answer 2

select DateAdded, count(CustID) 
from tbl 
group by DateAdded 

約7天的間隔是DB-根據問題

Answer 3

SELECT count(*), dateadded FROM Responses 
WHERE DateAdded >=dateadd(day,datediff(day,0,GetDate())- 7,0) 
group by dateadded 

RETURN 

這會給你的記錄數爲每個dateadded值。不要在添加更多列的錯誤，期望每天只得到一個計數。 group by子句將爲您列出的每個唯一實例列提供一行。

Answer 4

select DateAdded, count(DateAdded) as num_records 
from your_table 
WHERE DateAdded >=dateadd(day,datediff(day,0,GetDate())- 7,0) 
group by DateAdded 
order by DateAdded 

Answer 5

SELECT DateAdded, COUNT(1) AS NUMBERADDBYDAY 
FROM Responses 
WHERE DateAdded >= dateadd(day,datediff(day,0,GetDate())- 7,0) 
GROUP BY DateAdded 

Answer 6

你也可以試試這個：

SELECT DISTINCT（DATE（dateadded））AS unique_date，COUNT（*）AS量 FROM表 GROUP BY unique_date ORDER BY unique_date ASC