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create table t as select 1 as id, 'admin' as role, 'A' as name union all select 2 as id, 'admin' as role, 'B' as name union all select 3 as id, 'admin' as role, 'C' as name union all select 4 as id, 'admin' as role, 'D' as name union all select 5 as id, 'user' as role, 'E' as name union all select 6 as id, 'user' as role, 'F' as name union all select 7 as id, 'user' as role, 'G' as name
select t.* from (select t.*, row_number() over (partition by role order by rand()) as seqnum from t ) t order by ((case when role = 'admin' then seqnum else 999 end) <= 2) desc, ((case when role = 'user' then seqnum else 999 end) <= 1) desc, rand() limit 4;
id
role
name
seqnum
2
admin
B
1
1
admin
A
2
7
user
G
1
5
user
E
2