i don't know how title problem properly.
heres table structure:
id | client_id | … id primary , auto increment. client_id on other hand can occur multiple times.
what want fetch rows client_id highest id ... heres example
id | client_id 1 | 1 2 | 1 3 | 2 4 | 3 5 | 2 so here client_id 1 , 2 occurs multiple times (because there newer version).
after query want following ids in results: 2,4,5 (because highest id in rows client_id 1 row id 2 , on)
if need columns can use select in
select * my_table (id, client_id) in ( select max(id), client_id my_table group client_id); but if need id
select id my_table (id, client_id) in ( select max(id), client_id my_table group client_id); or more simple
select max(id) my_table group client_id;
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