MYSQL: Adding fields which are aliases and have operations - mysql

Question

Good day! I want to add fields "duration and dials"
Here is my mysql query:
select
u.dialer_display_name,
u.dialer_ext,
sum(dl.duration/60) as duration,
count(dl.dial_id) as dials
from leads.dial_log as dl
left join leads.users as u on u.user_id=dl.user_id
where date(dl.dial_date) = date(now())
and u.dialer_display_name != ''
group by dl.user_id order by dials DESC
So what I want to achieve is to add duration and dials and alias them as mets.
Something like:
select sum(duration+dials) as mets
How to build the query? Thanks!

Answer 1

Just add the two terms making the respective columns:
SELECT u.dialer_display_name,
u.dialer_ext,
SUM(dl.duration/60) AS duration,
COUNT(dl.dial_id) AS dials,
SUM(dl.duration/60) + COUNT(dl.dial_id) AS mets -- here is your column
FROM leads.dial_log AS dl
LEFT JOIN leads.users AS u
ON u.user_id = dl.user_id
WHERE DATE(dl.dial_date) = DATE(NOW()) AND
u.dialer_display_name != ''
GROUP BY dl.user_id
ORDER BY dials DESC

Answer 2

You need to repeat the logic, because you cannot re-use the aliases:
select u.dialer_display_name, u.dialer_ext,
sum(dl.duration/60) as duration,
count(dl.dial_id) as dials,
(sum(dl.duration/60) + count(dl.dial_id) ) as mets
from leads.dial_log dl join
leads.users u
on u.user_id = dl.user_id
where dl.dial_date >= curdate() and
dl.dial_date < date_add(curdate(), interval 1 day) and
u.dialer_display_name <> ''
group by u.dialer_display_name, u.dialer_ext
order by dials DESC;
Notes:
The comparison in the where using date() has been replaced with two comparisons. This allows the use of an index (if available).
date(now()) has been replaced with curdate().
The group by has been modified to match the columns in the select.
The left join has been replaced with an inner join. The where clause undoes the left join, so don't be misleading.
The new column has been added.
I will also say that count(dl.dial_id) seems strange. I suspect you want one of the following:
count(distinct dl.dial_id)
count(*)