根据日期列上的间隔（天）计数记录

Question

count data between intervals,interval depends on how much older the record

I have a table called complaint in which I have many columns with ComplaintDate ,I want to show count of records depends on interval .

Following interval will be used to categorized records:

1. number of compalaint which is 10 days older.
2. number of compalaint which is 10-20 days older.
3. number of compalaint which is 20-30 days older.
4. number of compalaint which is more than 30 days older.

I have tried something like this

select SUM(CASE WHEN ComplaintDate BETWEEN DATEADD (dd,-10,getdate())AND   GETDATE()  THEN 1 ELSE 0 END) As '0-10',
       SUM(CASE WHEN ComplaintDate BETWEEN  DATEADD (dd,-20,getdate()) AND DATEADD (dd,-10,getdate()) THEN 1 ELSE 0 END) AS '10-20',
       SUM(CASE WHEN ComplaintDate BETWEEN DATEADD (dd,-30,getdate()) AND DATEADD (dd,-20,getdate()) THEN 1 ELSE 0 END) AS '20-30'       
 FROM Complaint 

also i want that day included in 0-10 days interval should not be count in 10-20 or 20-30 days interval and same should apply for other other intervals as well .

Answer 1

select 
SUM(CASE WHEN ComplaintDate > DATEADD (dd,-10,getdate()) AND   ComplaintDate <= GETDATE()  THEN 1 ELSE 0 END) As '0-10',

SUM(CASE WHEN ComplaintDate > DATEADD (dd,-20,getdate()) AND ComplaintDate<=DATEADD (dd,-10,getdate()) THEN 1 ELSE 0 END) AS '10-20',

SUM(CASE WHEN ComplaintDate > DATEADD (dd,-30,getdate()) AND ComplaintDate <=DATEADD (dd,-20,getdate()) THEN 1 ELSE 0 END) AS '20-30'    

FROM Complaint