COUNT operation in my query

Question

0.00/5 (No votes)

See more:

SQL-Server-2008R2

i applied this query over my data in SQL server for calculating difference between max and min date group by Some id, my query is as follows

SQL

SELECT COUNT(DIFF)
MaxDate,
MinDate,
DATEDIFF(D, MinDate, MaxDate)/30 AS DIFF
FROM (
SELECT
   MAX(TDate) AS MaxDate,
   MIN(TDate) AS MinDate
   FROM EDATA
   GROUP BY TCard
)a

This query is producing result as

SQL

DIFF
10
5
10
10
5
7

Now i want to apply count operation over this to calculate occurring of particular difference as

SQL

Count
3
2
1

I want to know how to apply count operation over my query for that particular functionality, mentioned above(for count)

Posted 28-Aug-14 20:53pm

Abhishek Jaiswall

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

syed shanu · Accepted Answer · 2014-08-28T21:03:00

Solution 1

Hi,

Check this Query :

SQL

SELECT 
--COUNT(DIFF)
Count(DATEDIFF(D, MinDate, MaxDate)/30) AS DIFF

FROM (
SELECT

   MAX(TDate) AS MaxDate,
   MIN(TDate) AS MinDate
   FROM EDATA
   GROUP BY TCard
)a
Group by DATEDIFF(D, MinDate, MaxDate)/30

Posted 28-Aug-14 21:03pm

syed shanu

Comments

Abhishek Jaiswall 29-Aug-14 3:21am

Thanks Buddy! :)

syed shanu 29-Aug-14 3:31am

i check with my table its working fine :
SELECT
--COUNT(DIFF)
Count(DATEDIFF(D, MinDate, MaxDate)/30) AS DIFF

FROM (
SELECT

MAX(IN_DATE) AS MaxDate,
MIN(IN_DATE) AS MinDate
FROM Operation
GROUP BY PROJ_ID
)a
Group by DATEDIFF(D, MinDate, MaxDate)/30

and my result like this :
Diff
104
31
38
36

Abhishek Jaiswall 29-Aug-14 4:24am

yeah, there was some other error, now its working fine. Thanks!

Abhishek Jaiswall 29-Aug-14 4:41am

I have one more question,
if i want to apply some more functionality(query operations) in that query for some extended functionality, then in case where am suppose to use WHERE clause (conditions can be several).
like if i want to sort data before doing date difference operation on the basic of Name, gender etc. from that

syed shanu 29-Aug-14 4:44am

You can do that try with your query if need support comment here

Abhishek Jaiswall 29-Aug-14 5:03am

I applied just 1 condition as,
SELECT
--COUNT(DIFF)
Count(DATEDIFF(D, MinDate, MaxDate)/30) AS DIFF

FROM (
SELECT

MAX(TDate) AS MaxDate,
MIN(TDate) AS MinDate
FROM EDATA

Where ID>2

GROUP BY TCard
)a
Group by DATEDIFF(D, MinDate, MaxDate)/30

now what if i want to apply many conditions. and sort data according to 1 condition like name, age, gender etc. (1 condition at a time)

syed shanu 29-Aug-14 5:05am

In condition you can add any no its nor problem and sorting as well .Just try your query if you have difficult paste it here

Abhishek Jaiswall 29-Aug-14 5:17am

Here's a query
with single operation, in place of one condition of sorting data I want several but only 1 condition gets applied at a time

SELECT
--COUNT(DIFF)
Count(DATEDIFF(D, MinDate, MaxDate)/30) AS DIFF

FROM (
SELECT

MAX(TDate) AS MaxDate,
MIN(TDate) AS MinDate
FROM EDATA

Where ID>2

GROUP BY TCard
)a
Group by DATEDIFF(D, MinDate, MaxDate)/30