How to count the no. of occurences of a value in a columns using SQL query?

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SQL-Server-2008

I need query to find the top three magazines having highest subscriptions during last one month from following tables...

Customer table: (cust_id is PK)

cus_id cust_name cust_no
  1      A          123
  2      B          234
  3      C          345

Magazine table: (mag_id is PK)

mag_id  mag_name
  1        Cover drive
  2        top gear
  3        business today
  4        india today
  5        Frontline

Subscription table: (cust_id and mag_id foreign keys)

cust_id  mag_id     start_date  end_date
  1           2      4-7-2013   4-6-2014
  2           2      4-9-2013   4-8-2014
  3           2      4-18-2013  4-17-2014
  2           4      4-18-2013  4-17-2014
  3           4      4-18-2013  4-17-2014
  1           5      4-18-2013  4-17-2014
  2           3      4-18-2013  4-17-2014
  1           1      4-18-2013  4-17-2014

Any help is highly appreciated..!

Posted 28-Apr-13 3:04am

A_ACHARYA

Updated 28-Apr-13 3:15am

Maciej Los

v2

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2 solutions

Solution 1

hi,

run query

SQL

select top 3 mag_id from Subscription  where start_date > GETDATE()-30 group by mag_id order by mag_id desc

by this you can get top three magaxine ids

thanks.

Posted 28-Apr-13 3:15am

ExpertITM

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Maciej Los · Accepted Answer · 2013-04-28T03:20:00

Try this:

SQL

DECLARE @dFrom DATETIME
DECLARE @dTo DATETIME

SET @dFrom = '01-04-2013'
SET @dTo = '30-04-2013'

SELECT TOP(3) MagazineName, SubscCount
FROM (
    SELECT M.mag_name AS MagazineName, COUNT(S.mad_id) AS SubscCount
    FROM Subscription AS S LEFT JOIN Magazine AS M ON S.mag_id = M.mag_id
    WHERE S.start_date>= @dFrom AND S.end_date<=@dTo
    GROUP BY M.mag_name
) AS T
ORDER BY SubscCount DESC