我只想从PostgreSQL中的时间戳中提取日期部分.
我需要它是postgresql DATE
类型,这样我就可以将它插入另一个期望值为DATE
的表中.
例如,如果我有2011/05/26 09:00:00
,我想要2011/05/26
I tried casting, but I only get 2011:
timestamp:date
cast(timestamp as date)
I tried 100 with 101:
SELECT to_date(to_char(timestamp, 'YYYY/MM/DD'), 'YYYY/MM/DD')
FROM val3 WHERE id=1;
I tried to make it a function:
CREATE OR REPLACE FUNCTION testing() RETURNS void AS '
DECLARE i_date DATE;
BEGIN
SELECT to_date(to_char(val1, "YYYY/MM/DD"),"YYYY/MM/DD")
INTO i_date FROM exampTable WHERE id=1;
INSERT INTO foo(testd) VALUES (i);
END
在PostgreSQL中,从时间戳中提取日期(yyyy/mm/dd)的最佳方法是什么?