DROP DATABASE IF EXISTS mcs92_db;
CREATE DATABASE mcs92_db;
USE mcs92_db;
CREATE TABLE t1(t1_d DATE, t1_t TIME, t1_dt DATETIME)ENGINE=Columnstore;
INSERT INTO t1 VALUES(NULL, NULL, NULL);
INSERT INTO t1 VALUES('0000-00-00', '00:00:00', '0000-00-00');
INSERT INTO t1 VALUES('2222-11-11', '12:12:12', '2020-11-11 12:12:12');
INSERT INTO t1 VALUES('2020-01-01', '11:11:11', '2020-12-31 12:34:56');
INSERT INTO t1 VALUES('2016-02-01', '11:11:11', '2017-02-01 12:12:12');
SELECT t1_d, t1_t, t1_dt, DATEDIFF(t1_dt, t1_d) FROM t1;
t1_d	t1_t	t1_dt	DATEDIFF(t1_dt, t1_d)
NULL	NULL	NULL	NULL
0000-00-00	00:00:00	0000-00-00 00:00:00	0
2222-11-11	12:12:12	2020-11-11 12:12:12	-73778
2020-01-01	11:11:11	2020-12-31 12:34:56	365
2016-02-01	11:11:11	2017-02-01 12:12:12	366
SELECT t1_d, t1_t, t1_dt, DATEDIFF(t1_dt, t1_d) "Datediff in days" FROM t1 WHERE t1_dt > 0;
t1_d	t1_t	t1_dt	Datediff in days
2222-11-11	12:12:12	2020-11-11 12:12:12	-73778
2020-01-01	11:11:11	2020-12-31 12:34:56	365
2016-02-01	11:11:11	2017-02-01 12:12:12	366
SELECT t1_d, t1_t, t1_dt, DAY(t1_dt), DAY(t1_d) FROM t1;
t1_d	t1_t	t1_dt	DAY(t1_dt)	DAY(t1_d)
NULL	NULL	NULL	NULL	NULL
0000-00-00	00:00:00	0000-00-00 00:00:00	0	0
2222-11-11	12:12:12	2020-11-11 12:12:12	11	11
2020-01-01	11:11:11	2020-12-31 12:34:56	31	1
2016-02-01	11:11:11	2017-02-01 12:12:12	1	1
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL 1 SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL 1 SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:13
2020-12-31 12:34:56	2020-12-31 12:34:57
2017-02-01 12:12:12	2017-02-01 12:12:13
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL -1 SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL -1 SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:11
2020-12-31 12:34:56	2020-12-31 12:34:55
2017-02-01 12:12:12	2017-02-01 12:12:11
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL 1 DAY) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL 1 DAY)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 12:12:12
2020-12-31 12:34:56	2021-01-01 12:34:56
2017-02-01 12:12:12	2017-02-02 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL -1 DAY) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL -1 DAY)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 12:12:12
2020-12-31 12:34:56	2020-12-30 12:34:56
2017-02-01 12:12:12	2017-01-31 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL 1 MONTH) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL 1 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-12-11 12:12:12
2020-12-31 12:34:56	2021-01-31 12:34:56
2017-02-01 12:12:12	2017-03-01 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL -1 MONTH) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL -1 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-10-11 12:12:12
2020-12-31 12:34:56	2020-11-30 12:34:56
2017-02-01 12:12:12	2017-01-01 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL 0 MONTH) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL 0 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:12
2020-12-31 12:34:56	2020-12-31 12:34:56
2017-02-01 12:12:12	2017-02-01 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '2:1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '2:1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:14:13
2020-12-31 12:34:56	2020-12-31 12:36:57
2017-02-01 12:12:12	2017-02-01 12:14:13
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '-2:1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '-2:1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:10:13
2020-12-31 12:34:56	2020-12-31 12:32:57
2017-02-01 12:12:12	2017-02-01 12:10:13
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '2:-1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '2:-1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:14:12
2020-12-31 12:34:56	2020-12-31 12:36:56
2017-02-01 12:12:12	2017-02-01 12:14:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '-2:-1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '-2:-1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:10:12
2020-12-31 12:34:56	2020-12-31 12:32:56
2017-02-01 12:12:12	2017-02-01 12:10:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '-1 2' DAY_HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '-1 2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 14:12:12
2020-12-31 12:34:56	2020-12-30 14:34:56
2017-02-01 12:12:12	2017-01-31 14:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '1 2' DAY_HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '1 2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 14:12:12
2020-12-31 12:34:56	2021-01-01 14:34:56
2017-02-01 12:12:12	2017-02-02 14:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '-1 -2' DAY_HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '-1 -2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 12:12:12
2020-12-31 12:34:56	2020-12-30 12:34:56
2017-02-01 12:12:12	2017-01-31 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '1 -2' DAY_HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '1 -2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 12:12:12
2020-12-31 12:34:56	2021-01-01 12:34:56
2017-02-01 12:12:12	2017-02-02 12:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '1.9' SECOND_MICROSECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '1.9' SECOND_MICROSECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:13.900000
2020-12-31 12:34:56	2020-12-31 12:34:57.900000
2017-02-01 12:12:12	2017-02-01 12:12:13.900000
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL '-1.9' SECOND_MICROSECOND) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL '-1.9' SECOND_MICROSECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:11.900000
2020-12-31 12:34:56	2020-12-31 12:34:55.900000
2017-02-01 12:12:12	2017-02-01 12:12:11.900000
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL 12 HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL 12 HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 00:12:12
2020-12-31 12:34:56	2021-01-01 00:34:56
2017-02-01 12:12:12	2017-02-02 00:12:12
SELECT t1_dt, DATE_ADD(t1_dt, INTERVAL -1 HOUR) FROM t1;
t1_dt	DATE_ADD(t1_dt, INTERVAL -1 HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 11:12:12
2020-12-31 12:34:56	2020-12-31 11:34:56
2017-02-01 12:12:12	2017-02-01 11:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL 1 SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL 1 SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:11
2020-12-31 12:34:56	2020-12-31 12:34:55
2017-02-01 12:12:12	2017-02-01 12:12:11
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL -1 SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL -1 SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:13
2020-12-31 12:34:56	2020-12-31 12:34:57
2017-02-01 12:12:12	2017-02-01 12:12:13
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL 1 DAY) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL 1 DAY)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 12:12:12
2020-12-31 12:34:56	2020-12-30 12:34:56
2017-02-01 12:12:12	2017-01-31 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL -1 DAY) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL -1 DAY)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 12:12:12
2020-12-31 12:34:56	2021-01-01 12:34:56
2017-02-01 12:12:12	2017-02-02 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL 1 MONTH) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL 1 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-10-11 12:12:12
2020-12-31 12:34:56	2020-11-30 12:34:56
2017-02-01 12:12:12	2017-01-01 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL -1 MONTH) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL -1 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-12-11 12:12:12
2020-12-31 12:34:56	2021-01-31 12:34:56
2017-02-01 12:12:12	2017-03-01 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL 0 MONTH) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL 0 MONTH)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:12
2020-12-31 12:34:56	2020-12-31 12:34:56
2017-02-01 12:12:12	2017-02-01 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '2:1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '2:1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:10:11
2020-12-31 12:34:56	2020-12-31 12:32:55
2017-02-01 12:12:12	2017-02-01 12:10:11
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '-2:1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '-2:1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:14:11
2020-12-31 12:34:56	2020-12-31 12:36:55
2017-02-01 12:12:12	2017-02-01 12:14:11
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '2:-1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '2:-1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:10:12
2020-12-31 12:34:56	2020-12-31 12:32:56
2017-02-01 12:12:12	2017-02-01 12:10:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '-2:-1' MINUTE_SECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '-2:-1' MINUTE_SECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:14:12
2020-12-31 12:34:56	2020-12-31 12:36:56
2017-02-01 12:12:12	2017-02-01 12:14:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '-1 2' DAY_HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '-1 2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 10:12:12
2020-12-31 12:34:56	2021-01-01 10:34:56
2017-02-01 12:12:12	2017-02-02 10:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '1 2' DAY_HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '1 2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 10:12:12
2020-12-31 12:34:56	2020-12-30 10:34:56
2017-02-01 12:12:12	2017-01-31 10:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '-1 -2' DAY_HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '-1 -2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-12 12:12:12
2020-12-31 12:34:56	2021-01-01 12:34:56
2017-02-01 12:12:12	2017-02-02 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '1 -2' DAY_HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '1 -2' DAY_HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-10 12:12:12
2020-12-31 12:34:56	2020-12-30 12:34:56
2017-02-01 12:12:12	2017-01-31 12:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '1.9' SECOND_MICROSECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '1.9' SECOND_MICROSECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:10.999991
2020-12-31 12:34:56	2020-12-31 12:34:54.999991
2017-02-01 12:12:12	2017-02-01 12:12:10.999991
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL '-1.9' SECOND_MICROSECOND) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL '-1.9' SECOND_MICROSECOND)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 12:12:12.999991
2020-12-31 12:34:56	2020-12-31 12:34:56.999991
2017-02-01 12:12:12	2017-02-01 12:12:12.999991
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL 12 HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL 12 HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 00:12:12
2020-12-31 12:34:56	2020-12-31 00:34:56
2017-02-01 12:12:12	2017-02-01 00:12:12
SELECT t1_dt, DATE_SUB(t1_dt, INTERVAL -1 HOUR) FROM t1;
t1_dt	DATE_SUB(t1_dt, INTERVAL -1 HOUR)
NULL	NULL
0000-00-00 00:00:00	NULL
2020-11-11 12:12:12	2020-11-11 13:12:12
2020-12-31 12:34:56	2020-12-31 13:34:56
2017-02-01 12:12:12	2017-02-01 13:12:12
SELECT t1_dt, DATE_FORMAT(t1_dt, '%Y-%m-%d') a, DATE_FORMAT(t1_d, '%a %D %b %Y') b, DATE_FORMAT(t1_d, '%W %D %M %Y') c FROM t1;
t1_dt	a	b	c
NULL	NULL	NULL	NULL
0000-00-00 00:00:00	0000-00-00	NULL	NULL
2020-11-11 12:12:12	2020-11-11	Mon 11th Nov 2222	Monday 11th November 2222
2020-12-31 12:34:56	2020-12-31	Wed 1st Jan 2020	Wednesday 1st January 2020
2017-02-01 12:12:12	2017-02-01	Mon 1st Feb 2016	Monday 1st February 2016
SELECT t1_dt, DATE_FORMAT(t1_dt, '%Y/%m/%d %T') a, DATE_FORMAT(t1_dt, '%a %D %b %Y %H:%i') b, DATE_FORMAT(t1_dt, '%W %D %M %Y %T') c FROM t1;
t1_dt	a	b	c
NULL	NULL	NULL	NULL
0000-00-00 00:00:00	0000/00/00 00:00:00	NULL	NULL
2020-11-11 12:12:12	2020/11/11 12:12:12	Wed 11th Nov 2020 12:12	Wednesday 11th November 2020 12:12:12
2020-12-31 12:34:56	2020/12/31 12:34:56	Thu 31st Dec 2020 12:34	Thursday 31st December 2020 12:34:56
2017-02-01 12:12:12	2017/02/01 12:12:12	Wed 1st Feb 2017 12:12	Wednesday 1st February 2017 12:12:12
SELECT @@lc_time_names;
@@lc_time_names
en_US
SELECT t1_dt, DAYNAME(t1_dt), DAYOFWEEK(t1_dt), WEEKDAY(t1_dt) FROM t1;
t1_dt	DAYNAME(t1_dt)	DAYOFWEEK(t1_dt)	WEEKDAY(t1_dt)
NULL	NULL	NULL	NULL
0000-00-00 00:00:00	NULL	NULL	NULL
2020-11-11 12:12:12	Wednesday	4	2
2020-12-31 12:34:56	Thursday	5	3
2017-02-01 12:12:12	Wednesday	4	2
SELECT t1_d, DAYNAME(t1_d), DAYOFWEEK(t1_d), WEEKDAY(t1_d) FROM t1;
t1_d	DAYNAME(t1_d)	DAYOFWEEK(t1_d)	WEEKDAY(t1_d)
NULL	NULL	NULL	NULL
0000-00-00	NULL	NULL	NULL
2222-11-11	Monday	2	0
2020-01-01	Wednesday	4	2
2016-02-01	Monday	2	0
SELECT t1_dt, EXTRACT(SECOND FROM t1_dt) 'SECOND', EXTRACT(DAY_HOUR FROM t1_dt) 'DAY_HOUR', EXTRACT(HOUR FROM t1_dt) 'HOUR', EXTRACT(MINUTE FROM t1_dt) 'MINUTE' FROM t1;
t1_dt	SECOND	DAY_HOUR	HOUR	MINUTE
NULL	NULL	NULL	NULL	NULL
0000-00-00 00:00:00	0	0	0	0
2020-11-11 12:12:12	12	1112	12	12
2020-12-31 12:34:56	56	3112	12	34
2017-02-01 12:12:12	12	112	12	12
SELECT t1_dt, EXTRACT(DAY FROM t1_dt) 'DAY', EXTRACT(YEAR FROM t1_dt) 'YEAR', EXTRACT(MONTH FROM t1_dt) 'MONTH', EXTRACT(WEEK FROM t1_dt) 'WEEK' FROM t1;
t1_dt	DAY	YEAR	MONTH	WEEK
NULL	NULL	NULL	NULL	NULL
0000-00-00 00:00:00	0	0	0	1
2020-11-11 12:12:12	11	2020	11	46
2020-12-31 12:34:56	31	2020	12	53
2017-02-01 12:12:12	1	2017	2	5
SELECT t1_dt, MONTH(t1_dt) FROM t1;
t1_dt	MONTH(t1_dt)
NULL	NULL
0000-00-00 00:00:00	0
2020-11-11 12:12:12	11
2020-12-31 12:34:56	12
2017-02-01 12:12:12	2
SELECT t1_dt, t1_t, TIMEDIFF(t1_dt, t1_t) FROM t1;
t1_dt	t1_t	TIMEDIFF(t1_dt, t1_t)
NULL	NULL	NULL
0000-00-00 00:00:00	00:00:00	NULL
2020-11-11 12:12:12	12:12:12	NULL
2020-12-31 12:34:56	11:11:11	NULL
2017-02-01 12:12:12	11:11:11	NULL
SELECT t1_dt, TIMEDIFF(t1_dt, '5555-11-11 12:58:11') FROM t1;
t1_dt	TIMEDIFF(t1_dt, '5555-11-11 12:58:11')
NULL	NULL
0000-00-00 00:00:00	-838:59:59
2020-11-11 12:12:12	-838:59:59
2020-12-31 12:34:56	-838:59:59
2017-02-01 12:12:12	-838:59:59
SELECT t1_t, TIMEDIFF('12:58:11', t1_t) FROM t1;
t1_t	TIMEDIFF('12:58:11', t1_t)
NULL	NULL
00:00:00	12:58:11
12:12:12	00:45:59
11:11:11	01:47:00
11:11:11	01:47:00
SELECT t1_d, t1_dt, TIMESTAMPDIFF(MONTH, t1_d, t1_dt) FROM t1;
t1_d	t1_dt	TIMESTAMPDIFF(MONTH, t1_d, t1_dt)
NULL	NULL	NULL
0000-00-00	0000-00-00 00:00:00	0
2222-11-11	2020-11-11 12:12:12	-2424
2020-01-01	2020-12-31 12:34:56	11
2016-02-01	2017-02-01 12:12:12	12
SELECT t1_d, t1_dt, TIMESTAMPDIFF(DAY, t1_d, t1_dt) FROM t1;
t1_d	t1_dt	TIMESTAMPDIFF(DAY, t1_d, t1_dt)
NULL	NULL	NULL
0000-00-00	0000-00-00 00:00:00	0
2222-11-11	2020-11-11 12:12:12	-73777
2020-01-01	2020-12-31 12:34:56	365
2016-02-01	2017-02-01 12:12:12	366
SELECT t1_d, t1_dt, TIMESTAMPDIFF(MINUTE, t1_d, t1_dt) FROM t1;
t1_d	t1_dt	TIMESTAMPDIFF(MINUTE, t1_d, t1_dt)
NULL	NULL	NULL
0000-00-00	0000-00-00 00:00:00	0
2222-11-11	2020-11-11 12:12:12	-106239587
2020-01-01	2020-12-31 12:34:56	526354
2016-02-01	2017-02-01 12:12:12	527772
SELECT t1_d, t1_dt, TIMESTAMPDIFF(SECOND, t1_d, t1_dt) FROM t1;
t1_d	t1_dt	TIMESTAMPDIFF(SECOND, t1_d, t1_dt)
NULL	NULL	NULL
0000-00-00	0000-00-00 00:00:00	0
2222-11-11	2020-11-11 12:12:12	-6374375268
2020-01-01	2020-12-31 12:34:56	31581296
2016-02-01	2017-02-01 12:12:12	31666332
SELECT t1_d, WEEK(t1_d), t1_dt, WEEK(t1_dt) FROM t1;
t1_d	WEEK(t1_d)	t1_dt	WEEK(t1_dt)
NULL	NULL	NULL	NULL
0000-00-00	1	0000-00-00 00:00:00	1
2222-11-11	45	2020-11-11 12:12:12	45
2020-01-01	0	2020-12-31 12:34:56	52
2016-02-01	5	2017-02-01 12:12:12	5
SELECT t1_d, YEAR(t1_d), t1_dt, YEAR(t1_dt) FROM t1;
t1_d	YEAR(t1_d)	t1_dt	YEAR(t1_dt)
NULL	NULL	NULL	NULL
0000-00-00	0	0000-00-00 00:00:00	0
2222-11-11	2222	2020-11-11 12:12:12	2020
2020-01-01	2020	2020-12-31 12:34:56	2020
2016-02-01	2016	2017-02-01 12:12:12	2017
DROP DATABASE mcs92_db;