how to count the records using datalist control

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SQL-Server-2008R2

Dear Friends,

I have three tables like tblStates(StateId, StateName) , tblCities (StateName, Id, CityName) & tblPost(Id, StateName, CityName, AdTitle, description). Now I would like to count the no.of ads posted in individual States & Cities using any bound Control.

Ex: Expected output is

Andhra Pradesh (20)
---------------
Vijayawada (5)
Guntur (5)
Visakapatnam (3)
Tirupati (5)
Kadapa (2)

Karnataka (20)
-----------
Bangalore (5)
Mangalore (5)
Mysore (5)
Belgum (5)

Tamilnadu (20)
---------
Chennai (10)
Coimbator (5)
Selum (3)
Hosur (2)

etc..

Note: StateName & CityName we can bind from tblStates & tblCities only and the count should be bind from tblPost table.

Thanks in advance.

Posted 23-Jul-15 2:21am

Member 10021658

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Wendelius · Answer 1 · 2015-07-23T03:28:00

Why not do the counting in the database when you fetch the data.

As an example if you list states and want to have count of cities in the state as another column you can of course use grouping (GROUP BY clause) but also one easy way is to use a correlated scalar query. For example:

SQL

SELECT s.StateName,
       (   SELECT COUNT(*) 
           FROM   tblCities c
           WHERE  c.StateName = s.StateName)
FROM   tblStates s

Using the same idea I believe it would be easy to count the ads.