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drop table if exists t1, test;
select extract(DAY_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(DAY_MICROSECOND FROM "1999-01-02 10:11:12.000123")
2101112000123
select extract(HOUR_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(HOUR_MICROSECOND FROM "1999-01-02 10:11:12.000123")
101112000123
select extract(MINUTE_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(MINUTE_MICROSECOND FROM "1999-01-02 10:11:12.000123")
1112000123
select extract(SECOND_MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(SECOND_MICROSECOND FROM "1999-01-02 10:11:12.000123")
12000123
select extract(MICROSECOND FROM "1999-01-02 10:11:12.000123");
extract(MICROSECOND FROM "1999-01-02 10:11:12.000123")
123
select date_format("1997-12-31 23:59:59.000002", "%f");
date_format("1997-12-31 23:59:59.000002", "%f")
000002
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000 99:99:99.999999" DAY_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000 99:99:99.999999" DAY_MICROSECOND)
2025-05-23 04:40:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99:99.999999" HOUR_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99:99.999999" HOUR_MICROSECOND)
1999-02-21 17:40:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99.999999" MINUTE_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000:99.999999" MINUTE_MICROSECOND)
1998-01-07 22:41:39.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "10000.999999" SECOND_MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "10000.999999" SECOND_MICROSECOND)
1998-01-01 02:46:40.000001
select date_add("1997-12-31 23:59:59.000002",INTERVAL "999999" MICROSECOND);
date_add("1997-12-31 23:59:59.000002",INTERVAL "999999" MICROSECOND)
1998-01-01 00:00:00.000001
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1 1:1:1.000002" DAY_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1 1:1:1.000002" DAY_MICROSECOND)
1997-12-30 22:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1:1.000002" HOUR_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1:1.000002" HOUR_MICROSECOND)
1997-12-31 22:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1.000002" MINUTE_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1:1.000002" MINUTE_MICROSECOND)
1997-12-31 23:58:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "1.000002" SECOND_MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "1.000002" SECOND_MICROSECOND)
1997-12-31 23:59:58.999999
select date_sub("1998-01-01 00:00:00.000001",INTERVAL "000002" MICROSECOND);
date_sub("1998-01-01 00:00:00.000001",INTERVAL "000002" MICROSECOND)
1997-12-31 23:59:59.999999
select adddate("1997-12-31 23:59:59.000001", 10);
adddate("1997-12-31 23:59:59.000001", 10)
1998-01-10 23:59:59.000001
select subdate("1997-12-31 23:59:59.000001", 10);
subdate("1997-12-31 23:59:59.000001", 10)
1997-12-21 23:59:59.000001
select datediff("1997-12-31 23:59:59.000001","1997-12-30");
datediff("1997-12-31 23:59:59.000001","1997-12-30")
1
select datediff("1997-11-31 23:59:59.000001","1997-12-31");
datediff("1997-11-31 23:59:59.000001","1997-12-31")
-30
select datediff("1997-11-31 23:59:59.000001",null);
datediff("1997-11-31 23:59:59.000001",null)
NULL
select weekofyear("1997-11-31 23:59:59.000001");
weekofyear("1997-11-31 23:59:59.000001")
49
select makedate(1997,1);
makedate(1997,1)
1997-01-01
select makedate(1997,0);
makedate(1997,0)
NULL
select addtime("1997-12-31 23:59:59.999999", "1 1:1:1.000002");
addtime("1997-12-31 23:59:59.999999", "1 1:1:1.000002")
1998-01-02 01:01:01.000001
select subtime("1997-12-31 23:59:59.000001", "1 1:1:1.000002");
subtime("1997-12-31 23:59:59.000001", "1 1:1:1.000002")
1997-12-30 22:58:57.999999
select addtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999");
addtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999")
NULL
select subtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999");
subtime("1997-12-31 23:59:59.999999", "1998-01-01 01:01:01.999999")
NULL
select subtime("01:00:00.999999", "02:00:00.999998");
subtime("01:00:00.999999", "02:00:00.999998")
-00:59:59.999999
select subtime("02:01:01.999999", "01:01:01.999999");
subtime("02:01:01.999999", "01:01:01.999999")
01:00:00.000000
select timediff("1997-01-01 23:59:59.000001","1995-12-31 23:59:59.000002");
timediff("1997-01-01 23:59:59.000001","1995-12-31 23:59:59.000002")
8807:59:59.999999
select timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002");
timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002")
46:58:57.999999
select timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002");
timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002")
-23:59:59.999999
select timediff("1997-12-31 23:59:59.000001","23:59:59.000001");
timediff("1997-12-31 23:59:59.000001","23:59:59.000001")
NULL
select timediff("2000:01:01 00:00:00", "2000:01:01 00:00:00.000001");
timediff("2000:01:01 00:00:00", "2000:01:01 00:00:00.000001")
-00:00:00.000001
select maketime(10,11,12);
maketime(10,11,12)
10:11:12
select maketime(25,11,12);
maketime(25,11,12)
25:11:12
select maketime(-25,11,12);
maketime(-25,11,12)
-25:11:12
select timestamp("2001-12-01", "01:01:01.999999");
timestamp("2001-12-01", "01:01:01.999999")
2001-12-01 01:01:01.999999
select timestamp("2001-13-01", "01:01:01.000001");
timestamp("2001-13-01", "01:01:01.000001")
NULL
select timestamp("2001-12-01", "25:01:01");
timestamp("2001-12-01", "25:01:01")
2001-12-02 01:01:01
select timestamp("2001-12-01 01:01:01.000100");
timestamp("2001-12-01 01:01:01.000100")
2001-12-01 01:01:01.000100
select timestamp("2001-12-01");
timestamp("2001-12-01")
2001-12-01 00:00:00
select day("1997-12-31 23:59:59.000001");
day("1997-12-31 23:59:59.000001")
31
select date("1997-12-31 23:59:59.000001");
date("1997-12-31 23:59:59.000001")
1997-12-31
select date("1997-13-31 23:59:59.000001");
date("1997-13-31 23:59:59.000001")
NULL
select time("1997-12-31 23:59:59.000001");
time("1997-12-31 23:59:59.000001")
23:59:59.000001
select time("1997-12-31 25:59:59.000001");
time("1997-12-31 25:59:59.000001")
NULL
select microsecond("1997-12-31 23:59:59.000001");
microsecond("1997-12-31 23:59:59.000001")
1
create table t1
select makedate(1997,1) as f1,
addtime(cast("1997-12-31 23:59:59.000001" as datetime), "1 1:1:1.000002") as f2,
addtime(cast("23:59:59.999999" as time) , "1 1:1:1.000002") as f3,
timediff("1997-12-31 23:59:59.000001","1997-12-30 01:01:01.000002") as f4,
timediff("1997-12-30 23:59:59.000001","1997-12-31 23:59:59.000002") as f5,
maketime(10,11,12) as f6,
timestamp(cast("2001-12-01" as date), "01:01:01") as f7,
date("1997-12-31 23:59:59.000001") as f8,
time("1997-12-31 23:59:59.000001") as f9;
describe t1;
Field Type Null Key Default Extra
f1 date 0000-00-00
f2 datetime 0000-00-00 00:00:00
f3 time 00:00:00
f4 time 00:00:00
f5 time 00:00:00
f6 time 00:00:00
f7 datetime 0000-00-00 00:00:00
f8 date 0000-00-00
f9 time 00:00:00
select * from t1;
f1 f2 f3 f4 f5 f6 f7 f8 f9
1997-01-01 1998-01-02 01:01:00 49:01:01 46:58:57 -23:59:59 10:11:12 2001-12-01 01:01:01 1997-12-31 23:59:59
create table test(t1 datetime, t2 time, t3 time, t4 datetime);
insert into test values
('2001-01-01 01:01:01', '01:01:01', null, '2001-02-01 01:01:01'),
('2001-01-01 01:01:01', '-01:01:01', '-23:59:59', "1997-12-31 23:59:59.000001"),
('1997-12-31 23:59:59.000001', '-23:59:59', '-01:01:01', '2001-01-01 01:01:01'),
('2001-01-01 01:01:01', '01:01:01', '-1 01:01:01', null),
('2001-01-01 01:01:01', null, '-1 01:01:01', null),
(null, null, null, null),
('2001-01-01 01:01:01', '01:01:01', '1 01:01:01', '2001-01-01 01:01:01');
SELECT ADDTIME(t1,t2) As ttt, ADDTIME(t2, t3) As qqq from test;
ttt qqq
2001-01-01 02:02:02 NULL
2001-01-01 00:00:00 -25:01:00
1997-12-31 00:00:00 -25:01:00
2001-01-01 02:02:02 -24:00:00
NULL NULL
NULL NULL
2001-01-01 02:02:02 26:02:02
SELECT TIMEDIFF(t1, t4) As ttt, TIMEDIFF(t2, t3) As qqq,
TIMEDIFF(t3, t2) As eee, TIMEDIFF(t2, t4) As rrr from test;
ttt qqq eee rrr
-744:00:00 NULL NULL NULL
26305:01:02 22:58:58 -22:58:58 NULL
-26305:01:02 -22:58:58 22:58:58 NULL
NULL 26:02:02 26:02:02 NULL
NULL NULL NULL NULL
NULL NULL NULL NULL
00:00:00 -24:00:00 24:00:00 NULL
drop table t1, test;
|
