time.sql

来自「PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统」· SQL 代码 · 共 37 行

--
-- TIME
--

CREATE TABLE TIME_TBL (f1 time(2));

INSERT INTO TIME_TBL VALUES ('00:00');
INSERT INTO TIME_TBL VALUES ('01:00');
-- as of 7.4, timezone spec should be accepted and ignored
INSERT INTO TIME_TBL VALUES ('02:03 PST');
INSERT INTO TIME_TBL VALUES ('11:59 EDT');
INSERT INTO TIME_TBL VALUES ('12:00');
INSERT INTO TIME_TBL VALUES ('12:01');
INSERT INTO TIME_TBL VALUES ('23:59');
INSERT INTO TIME_TBL VALUES ('11:59:59.99 PM');

SELECT f1 AS "Time" FROM TIME_TBL;

SELECT f1 AS "Three" FROM TIME_TBL WHERE f1 < '05:06:07';

SELECT f1 AS "Five" FROM TIME_TBL WHERE f1 > '05:06:07';

SELECT f1 AS "None" FROM TIME_TBL WHERE f1 < '00:00';

SELECT f1 AS "Eight" FROM TIME_TBL WHERE f1 >= '00:00';

--
-- TIME simple math
--
-- We now make a distinction between time and intervals,
-- and adding two times together makes no sense at all.
-- Leave in one query to show that it is rejected,
-- and do the rest of the testing in horology.sql
-- where we do mixed-type arithmetic. - thomas 2000-12-02

SELECT f1 + time '00:01' AS "Illegal" FROM TIME_TBL;