I have 2 tables
Customers
----------------
ID | Name
----+-----------
123 | Name1
456 | Name2
789 | Name3
----------------
Invoices
------------------
ID | Value
----+-------------
123 | 1000
456 | 500
789 | 1000
------------------
I want to select customer names with the maximum invoice value
Test against the max value
select c.name , i.value
from customers c
join invoices i on i.id = c.id
where i.value = (select max(value) from invoices);
+-------+-------+
| name | value |
+-------+-------+
| Name1 | 1000 |
| Name3 | 1000 |
+-------+-------+
2 rows in set (0.001 sec)