[MySQL] row sorting in MySQL

mysql Bank of China sort

1. Data preparation

drop table if exists kwan.tmp_learning_mary;
create table if not exists kwan.tmp_learning_mary(
    id varchar(10)
    , name varchar(10) 
    ,age varchar(10)
    , salary int 
);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (1, 'a', 10, 8000);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (1, 'a2', 11, 6500);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (2, 'b', 12, 13000);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (2, 'b2', 13, 4500);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (3, 'c', 14, 3000);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (3, 'c2', 15, 20000);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (4, 'd', 16, 30000);
insert into kwan.tmp_learning_mary(id, name, age, salary)
values (5, 'd2', 17, 1800);

2. To write sql Conditional

select
	*
from
	(
	select
		*,
		row_number() over(partition by id
	order by
		salary desc) ranking
	from
		tmp_learning_mary) t
where
	t.ranking < 2;

3. To write sql Without conditions

select
	*
from
	(
	select
		*,
		row_number() over(partition by id
	order by
		salary desc) ranking
	from
		tmp_learning_mary) t