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create table t as select 'ag' as a, 1 as b union all select 'sb' as a, 1 as b union all select 'sf' as a, 1 as b union all select 'xk' as a, 2 as b union all select 'bd' as a, 2 as b union all select 've' as a, 2 as b union all select 'ku' as a, 2 as b union all select 'lt' as a, 3 as b union all select 'ac' as a, 3 as b
SELECT 9
select t.* from (select t.*, count(*) filter (where a = 'bd') over (order by b, a rows between 2 preceding and 2 following ) as cnt from t ) t where cnt > 0
a
b
cnt
sb
1
1
sf
1
1
bd
2
1
ku
2
1
ve
2
1
SELECT 5