create table t1 (
pk int primary key,
a int,
b int,
c char(10),
d decimal(10, 3),
e real
);
insert into t1 values
( 1, 0, 1,    'one',    0.1,  0.001),
( 2, 0, 2,    'two',    0.2,  0.002),
( 3, 0, 3,    'three',  0.3,  0.003),
( 4, 1, 2,    'three',  0.4,  0.004),
( 5, 1, 1,    'two',    0.5,  0.005),
( 6, 1, 1,    'one',    0.6,  0.006),
( 7, 2, NULL, 'n_one',  0.5,  0.007),
( 8, 2, 1,    'n_two',  NULL, 0.008),
( 9, 2, 2,    NULL,     0.7,  0.009),
(10, 2, 0,    'n_four', 0.8,  0.010),
(11, 2, 10,   NULL,     0.9,  NULL);
select pk, first_value(pk) over (order by pk),
last_value(pk) over (order by pk),
first_value(pk) over (order by pk desc),
last_value(pk) over (order by pk desc)
from t1
order by pk desc;
pk	first_value(pk) over (order by pk)	last_value(pk) over (order by pk)	first_value(pk) over (order by pk desc)	last_value(pk) over (order by pk desc)
11	1	11	11	11
10	1	10	11	10
9	1	9	11	9
8	1	8	11	8
7	1	7	11	7
6	1	6	11	6
5	1	5	11	5
4	1	4	11	4
3	1	3	11	3
2	1	2	11	2
1	1	1	11	1
select pk,
first_value(pk) over (order by pk
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
last_value(pk) over (order by pk
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
first_value(pk) over (order by pk desc
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
last_value(pk) over (order by pk desc
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
from t1
order by pk;
pk	first_value(pk) over (order by pk
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)	last_value(pk) over (order by pk
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)	first_value(pk) over (order by pk desc
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)	last_value(pk) over (order by pk desc
RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
1	1	11	11	1
2	1	11	11	1
3	1	11	11	1
4	1	11	11	1
5	1	11	11	1
6	1	11	11	1
7	1	11	11	1
8	1	11	11	1
9	1	11	11	1
10	1	11	11	1
11	1	11	11	1
select pk,
first_value(pk) over (order by pk desc),
last_value(pk) over (order by pk desc)
from t1;
pk	first_value(pk) over (order by pk desc)	last_value(pk) over (order by pk desc)
1	11	1
2	11	2
3	11	3
4	11	4
5	11	5
6	11	6
7	11	7
8	11	8
9	11	9
10	11	10
11	11	11
select pk, a, b, c, d, e,
first_value(b) over (partition by a order by pk) as fst_b,
last_value(b) over (partition by a order by pk) as lst_b,
first_value(c) over (partition by a order by pk) as fst_c,
last_value(c) over (partition by a order by pk) as lst_c,
first_value(d) over (partition by a order by pk) as fst_d,
last_value(d) over (partition by a order by pk) as lst_d,
first_value(e) over (partition by a order by pk) as fst_e,
last_value(e) over (partition by a order by pk) as lst_e
from t1;
pk	a	b	c	d	e	fst_b	lst_b	fst_c	lst_c	fst_d	lst_d	fst_e	lst_e
1	0	1	one	0.100	0.001	1	1	one	one	0.100	0.100	0.001	0.001
2	0	2	two	0.200	0.002	1	2	one	two	0.100	0.200	0.001	0.002
3	0	3	three	0.300	0.003	1	3	one	three	0.100	0.300	0.001	0.003
4	1	2	three	0.400	0.004	2	2	three	three	0.400	0.400	0.004	0.004
5	1	1	two	0.500	0.005	2	1	three	two	0.400	0.500	0.004	0.005
6	1	1	one	0.600	0.006	2	1	three	one	0.400	0.600	0.004	0.006
7	2	NULL	n_one	0.500	0.007	NULL	NULL	n_one	n_one	0.500	0.500	0.007	0.007
8	2	1	n_two	NULL	0.008	NULL	1	n_one	n_two	0.500	NULL	0.007	0.008
9	2	2	NULL	0.700	0.009	NULL	2	n_one	NULL	0.500	0.700	0.007	0.009
10	2	0	n_four	0.800	0.01	NULL	0	n_one	n_four	0.500	0.800	0.007	0.01
11	2	10	NULL	0.900	NULL	NULL	10	n_one	NULL	0.500	0.900	0.007	NULL
drop table t1;