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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)
11 11 11
10 11 10
9 11 9
8 11 8
7 11 7
6 11 6
5 11 5
4 11 4
3 11 3
2 11 2
1 11 1
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;
#
# MDEV-11746: Wrong result upon using FIRST_VALUE with a window frame
#
create table t1 (i int);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
select i,
first_value(i) OVER (order by i rows between CURRENT ROW and 1 FOLLOWING) as fst_1f,
last_value(i) OVER (order by i rows between CURRENT ROW and 1 FOLLOWING) as last_1f,
first_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
last_value(i) OVER (order by i rows between 1 PRECEDING AND 1 FOLLOWING) as fst_1p1f,
first_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
last_value(i) OVER (order by i rows between 2 PRECEDING AND 1 PRECEDING) as fst_2p1p,
first_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f,
last_value(i) OVER (order by i rows between 1 FOLLOWING AND 2 FOLLOWING) as fst_1f2f
from t1;
i fst_1f last_1f fst_1p1f fst_1p1f fst_2p1p fst_2p1p fst_1f2f fst_1f2f
1 1 2 1 2 NULL NULL 2 3
2 2 3 1 3 1 1 3 4
3 3 4 2 4 1 2 4 5
4 4 5 3 5 2 3 5 6
5 5 6 4 6 3 4 6 7
6 6 7 5 7 4 5 7 8
7 7 8 6 8 5 6 8 9
8 8 9 7 9 6 7 9 10
9 9 10 8 10 7 8 10 10
10 10 10 9 10 8 9 NULL NULL
drop table t1;
#
# MDEV-12861 FIRST_VALUE() does not preserve the exact data type
#
CREATE TABLE t1 (a INT, b INT, c FLOAT);
INSERT INTO t1 VALUES (1,1,1),(1,2,2),(2,1,1),(2,2,2);
CREATE TABLE t2 AS SELECT a, FIRST_VALUE(b) OVER(), FIRST_VALUE(c) OVER() FROM t1 GROUP BY a;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) DEFAULT NULL,
`FIRST_VALUE(b) OVER()` int(11) DEFAULT NULL,
`FIRST_VALUE(c) OVER()` float DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
DROP TABLE t2,t1;
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