How to use SQL SELECT as field name - sql

Question

I'm trying to use select as column name to store the get total member, But I didn't succeed to get the solution for the right sql statement to use.
Here is my database table structure and sql that I have used.
Sql
SELECT
name,
SELECT
(
(COALESCE(SUM(adult),0) + COALESCE(SUM(elders),0))
) as total
FROM members
LEFT JOIN company
ON company.companyId = members.companyId
GROUP BY company.companyId
My tables
company table
+----------------------+
| companyId | Name |
+-----------+----------+
| 1 | Company1 |
| 2 | Company2 |
+-----------+----------+
members table
+--------------------------------------------+
| id | companyId | gender | adult | elders |
+------+-----------+--------+-------+--------+
| 1 | 1 | male | 200 | 700 |
| 1 | 1 | female | 300 | 50 |
| 1 | 2 | male | 100 | 500 |
| 1 | 2 | female | 900 | 800 |
+------+-----------+--------+-------+--------+
expected Results table
+-------------------------------------------------+
| companyId | Name | adult | elders | Total |
+-----------+----------+-------+--------+---------+
| 1 | Company1 | 500 | 750 | 1250 |
| 1 | Company2 | 1000 | 1300 | 2300 |
+-----------+----------+-------+--------+---------+
Thanks in advance

Answer 1

A LEFT JOIN starting on members is not appropriate, unless members could lack a company. I'll just use a regular JOIN.
Then you want aggregation with arithmetic:
SELECT c.companyId, c.name,
SUM(m.adults + m.elders) as total,
SUM(m.adults) as adults, SUM(m.elders) as elders
FROM members m JOIN
company c
ON c.companyId = m.companyId
GROUP BY c.companyId, c.name;
You would use a LEFT JOIN if one of the following were true and you wanted to avoid filtering rows out:
Some members do not have a valid companyId.
Some companies have no rows in members.