Question

My table are

 login_table
    {
    varchar: User_id//primary key
    //other stuff
    }
   token_table
   {
    varchar token_table;//primary key
    varchar user_id
   }
   token_messages
   {varchar: Mes_id
   varchar: token_id;
    }

Now i want get a count of messages for each token under some user;
Like :

token_id Mes_count
1          5
5          12
6          0
7          4 

Here 1 5 6 7 are the token of say user :deepu

Answer 1

Try this:

select tm.token_id,count(*) as msg_cnt from 
token_messages tm inner join token_table t
on tm.token_id=t.token_id and t.user_id in(select user_id from login_table where user_name = 'deepu')
group by tm.token_id