[Conny Westh]

Har testat lite med MS SQL-server, och har inte hunnit konvetrea till MySQL ännu menprincipen borde vara densamma:

select *

FROM(

select posid, datum,  
(
	select top 1 datum
	from position p2 
	where p2.datum < p1.datum
	order by 1 desc
)  as [bak],
(
	select top 1 datum
	from position p2 
	where p2.datum > p1.datum+3
	order by 1 asc
)  as [fram]
from Position p1
) Tabpos
where fram > datum

Behövs givetvis lite mer logik men en start i alla fall...