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create table parent (id int, name varchar, max_version int);
insert into parent values (1, 'first', 3), (2, 'second', 1);
create table children (id int, parent_id int, version int, data varchar);
insert into children values
(1, 1, 1, 'data1'),
(2, 1, 2, 'data2'),
(3, 1, 3, 'data3'),
(4, 2, 1, 'data4');
SELECT p.name, c.data
FROM parent p
JOIN children c on p.id=c.parent_id
WHERE p.max_version = c.version;
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