我如何结合这些mysql语句

Question

I am currently doing this:

    SELECT SS.service_name , SS.id, SH.shortcode FROM smsc_app_db.service SS
 INNER JOIN shortcode SH ON SS.confirmation_shortcode = SH.id;

    SELECT count(service_id) FROM smsc_app_db.service_status 
where smsc_app_db.service_status.service_id = ?;

After running the first select, I get the result in java, then for each row of the ResultSet, I use the SS.ID value to count the number of subscribers to that service on the service_status table (using the second statement)

But I would like to combine the 2 statements into one.

Is it possible to make the select count(service_id)

a column in the first select statement?

eg if the result of

select count(service_id).... is stored in subscriber_base

    SELECT SS.service_name , SS.id, SH.shortcode, subscriber_base FROM 
smsc_app_db.service SS INNER JOIN shortcode SH ON SS.confirmation_shortcode = SH.id;

Answer 1

join the service_status table to the existing query and aggregate to get the counts.

SELECT SS.service_name, SS.id, SH.shortcode, count(*) subscriber_base 
FROM smsc_app_db.service SS 
INNER JOIN shortcode SH ON SS.confirmation_shortcode = SH.id
INNER JOIN smsc_app_db.service_status sstat ON sstat.service_id = SS.id
GROUP BY SS.service_name, SS.id, SH.shortcode