2023-01-29 时间类型操作.md

postgresql-时间类型操作

operator	example	result
+	select date '2023-01-29' + integer '1';	2023-01-30
+	select date '2023-01-29' + interval '1 hour';	2023-01-29 01:00:00
+	select date '2023-01-29' + time '03:00';	2023-01-29 03:00:00
+	select interval '1 day' + interval '1 hour';	1 day 01:00:00
+	select timestamp '2023-01-29 01:00' + interval '23 hours';	2023-01-30 00:00:00
+	select time '01:00' + interval '3 hours';	04:00:00
-	select - interval '23 hours';	-23:00:00
-	select date '2023-01-29' - date '2023-01-25';	4
-	select date '2023-01-29' - integer '7';	2023-01-22
-	select date '2023-01-29' - interval '1 hour';	2023-01-28 23:00:00
-	select time '05:00' - interval '2 hours';	03:00:00
-	select timestamp '2023-01-29 23:00:00' - interval '23 hours';	2023-01-29 00:00:00
-	select interval '1 day' - interval '1 hour';	1 day -01:00:00
-	select timestamp '2023-01-29 03:00' -timestamp '2023-01-28 12:00';	15:00:00
*	select 900 * interval '1 second';	00:15:00
*	select 21 * interval '1 day';	21 days
*	select double precision '3.5' * interval '1 hour';	03:30:00
/	select interval '1 hour' / double precision '1.5';	00:40:00