Aqui está uma demonstração do SQLFiddle Antes de tudo, crie tabelas temporárias para simplificar as consultas, embora você possa colocar essas consultas de criação em consultas finais e fazê-lo sem tabelas temporárias:
create table t as select * from
(
select null s ,"start"-1 as e from data
union all
select "start" s,null e from data
union all
select "end"+1 s ,null e from data
union all
select null s ,"end" e from data
) d where exists (select "start"
from data where d.s between data."start" and data."end"
or d.e between data."start" and data."end"
);
--Operation 1 - Disjoined Result
create table t1 as select s,e,e-s+1 width from
(
select distinct s,(select min(e) from t where t.e>=t1.s) e from t t1
) t2 where t2.s is not null and t2.e is not null;
--Operation 2 - Reduced Result
create table t2 as
select s,e,e-s+1 width from
(
select s,(select min(d2.e) from t1 d2 where d2.s>=d.s and not exists
(select s from t1 where t1.s=d2.e+1) ) e
from
t1 d where not exists(select s from t1 where t1.e=d.s-1)
) t2;
--Temp table for Operation 3 - Gaps
create table t3 as
select null s, s-1 e from t2
union all
select e+1 s, null e from t2;
Agora vamos as consultas:
--Operation 1 - Disjoined Result
select * from t1 order by s;
--Operation 2 - Reduced Result
select * from t2 order by s;
--Operation 3 - Gaps
select s,e,e-s+1 width
from
(
select s,(select min(e) from t3 where t3.e>=d.s) e from t3 d
) t4 where s is not null and e is not null
order by s;
