SQL>
SQL> create table pages(
2 page_id number,
3 seq number )
4 /
Table created.
SQL> insert into pages values ( 1, 10 );
1 row created.
SQL> insert into pages values ( 2, 20 );
1 row created.
SQL> insert into pages values ( 3, 30 );
1 row created.
SQL> insert into pages values ( 4, 40 );
1 row created.
SQL> commit;
Commit complete.
SQL>
SQL> select lag( page_id, 1, null )
2 over ( order by seq ) prev,
3 page_id,
4 lead( page_id, 1, null )
5 over ( order by seq ) next
6 from pages
7 where page_id = 3
8 /
PREV PAGE_ID NEXT
---------- ---------- ----------
3
SQL>
SQL> drop table pages;
Table dropped.