1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
SET DEFAULT_STORAGE_ENGINE = 'tokudb';
DROP TABLE IF EXISTS foo;
create table foo (a timestamp(6), b timestamp(4), c timestamp(5), primary key (a))engine=tokudb;
insert into foo values ('2010-12-10 14:12:09.123452', '2010-12-10 14:12:09.123416', '2010-12-10 14:12:09.123451');
insert into foo values ('2010-12-10 14:12:09.123454', '2010-12-10 14:12:09.123416', '2010-12-10 14:12:09.123451');
insert into foo values ('2010-12-10 14:12:09.123451', '2010-12-10 14:12:09.123416', '2010-12-10 14:12:09.123451');
insert into foo values ('2010-12-10 14:12:09.123453', '2010-12-10 14:12:09.123416', '2010-12-10 14:12:09.123451');
select * from foo;
a b c
2010-12-10 14:12:09.123451 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123452 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123453 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123454 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
explain select * from foo where a > '2010-12-10 14:12:09.123452';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE foo range PRIMARY PRIMARY 7 NULL 2 Using where
select * from foo where a > '2010-12-10 14:12:09.123452';
a b c
2010-12-10 14:12:09.123453 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123454 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
alter table foo change a a datetime(6), change b b datetime(4), change c c datetime(5);
show create table foo;
Table Create Table
foo CREATE TABLE `foo` (
`a` datetime(6) NOT NULL DEFAULT '0000-00-00 00:00:00.000000',
`b` datetime(4) DEFAULT NULL,
`c` datetime(5) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=TokuDB DEFAULT CHARSET=latin1
select * from foo;
a b c
2010-12-10 14:12:09.123451 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123452 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123453 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123454 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
explain select * from foo where a > '2010-12-10 14:12:09.123452';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE foo range PRIMARY PRIMARY 8 NULL 2 Using where
select * from foo where a > '2010-12-10 14:12:09.123452';
a b c
2010-12-10 14:12:09.123453 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
2010-12-10 14:12:09.123454 2010-12-10 14:12:09.1234 2010-12-10 14:12:09.12345
drop table foo;
create table foo (a time(6), b time(4), c time(5), primary key (a))engine=TokuDB;
insert into foo values ('14:12:09.123452', '14:12:09.123416', '14:12:09.123451');
insert into foo values ('14:12:09.123454', '14:12:09.123416', '14:12:09.123451');
insert into foo values ('14:12:09.123451', '14:12:09.123416', '14:12:09.123451');
insert into foo values ('14:12:09.123453', '14:12:09.123416', '14:12:09.123451');
select * from foo;
a b c
14:12:09.123451 14:12:09.1234 14:12:09.12345
14:12:09.123452 14:12:09.1234 14:12:09.12345
14:12:09.123453 14:12:09.1234 14:12:09.12345
14:12:09.123454 14:12:09.1234 14:12:09.12345
explain select * from foo where a > '14:12:09.123452';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE foo range PRIMARY PRIMARY 6 NULL 2 Using where
select * from foo where a > '14:12:09.123452';
a b c
14:12:09.123453 14:12:09.1234 14:12:09.12345
14:12:09.123454 14:12:09.1234 14:12:09.12345
DROP TABLE foo;
|
