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69 lines
2.9 KiB
69 lines
2.9 KiB
5 months ago
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DROP TABLE IF EXISTS t1;
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show variables like "system_time_zone";
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Variable_name Value
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system_time_zone MET
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select @a:=FROM_UNIXTIME(1);
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@a:=FROM_UNIXTIME(1)
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1970-01-01 01:00:01
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Warnings:
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Warning 1287 Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
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select unix_timestamp(@a);
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unix_timestamp(@a)
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1
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CREATE TABLE t1 (ts int);
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 01:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 02:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 03:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 02:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 01:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2002-10-27 02:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2003-03-30 02:59:59'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2003-03-30 03:00:00'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2003-03-30 03:59:59'));
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INSERT INTO t1 (ts) VALUES (Unix_timestamp('2003-03-30 04:00:01'));
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SELECT ts,from_unixtime(ts) FROM t1;
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ts from_unixtime(ts)
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1035673200 2002-10-27 01:00:00
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1035680400 2002-10-27 02:00:00
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1035684000 2002-10-27 03:00:00
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1035680400 2002-10-27 02:00:00
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1035673200 2002-10-27 01:00:00
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1035680400 2002-10-27 02:00:00
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1048986000 2003-03-30 03:00:00
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1048986000 2003-03-30 03:00:00
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1048989599 2003-03-30 03:59:59
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1048989601 2003-03-30 04:00:01
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DROP TABLE t1;
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CREATE TABLE t1 (ts timestamp);
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INSERT IGNORE INTO t1 (ts) VALUES ('2003-03-30 01:59:59'),
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('2003-03-30 02:59:59'),
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('2003-03-30 03:00:00');
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Warnings:
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Warning 1299 Invalid TIMESTAMP value in column 'ts' at row 2
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DROP TABLE t1;
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select unix_timestamp('1970-01-01 01:00:00'),
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unix_timestamp('1970-01-01 01:00:01'),
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unix_timestamp('2038-01-19 04:14:07'),
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unix_timestamp('2038-01-19 04:14:08');
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unix_timestamp('1970-01-01 01:00:00') unix_timestamp('1970-01-01 01:00:01') unix_timestamp('2038-01-19 04:14:07') unix_timestamp('2038-01-19 04:14:08')
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0 1 2147483647 0
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CREATE TABLE t1 (c1 TIMESTAMP);
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SET TIME_ZONE = '+00:00';
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SET explicit_defaults_for_timestamp=OFF;
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Warnings:
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Warning 1287 'explicit_defaults_for_timestamp' is deprecated and will be removed in a future release.
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INSERT INTO t1 VALUES('2019-10-27 00:47:42'), ('2019-10-27 00:47:42');
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INSERT INTO t1 VALUES('2019-10-27 01:47:42'), ('2019-10-27 01:47:42');
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SET TIME_ZONE = 'SYSTEM';
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SELECT DISTINCT c1 FROM t1;
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c1
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2019-10-27 02:47:42
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SELECT COUNT(*) FROM t1 GROUP BY c1;
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ERROR HY000: Grouping on temporal is non-deterministic for timezones having DST. Please consider switching to UTC for this query.
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SET sql_mode='';
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SELECT COUNT(*) FROM t1 GROUP BY c1;
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ERROR HY000: Grouping on temporal is non-deterministic for timezones having DST. Please consider switching to UTC for this query.
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SET sql_mode=DEFAULT;
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SET explicit_defaults_for_timestamp=ON;
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DROP TABLE t1;
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