问题
I need a query that displays dates in the following format:
Dates that fall in the past 7 days -> “one week ago” Dates that fall in the past 7 to 14 days -> “two week ago” Etc…
Dates that fall in the past 30 days -> “one month ago” Dates that follow in the past 30 to 60 days -> “two months ago Etc..
Dates that fall in the past 365 days -> “one year ago” Dates that fall in the past 365 to 730 days -> “two years ago Etc...
If you guys can point me to the right direction I’ll appreciate it.
Thank you
回答1:
As stated above, use a case statement in your SQL query. Something like this:
SELECT
Column1,
Column2,
theDate,
CASE
WHEN DATEDIFF(dd, theDate, GetDate()) =< 7 THEN 'One Week Ago'
WHEN DATEDIFF(dd, theDate, GetDate()) > 7 AND DATEDIFF(dd, theDate, GetDate()) < 30 THEN 'One Month Ago'
-- ...
END
AS TimeAgo,
Column3,
Column4
FROM Table1
More Information for MS SQL: http://msdn.microsoft.com/en-us/library/ms181765.aspx (Or see the documentation for your SQL server brand)
回答2:
Here is a mysql function I wrote called time_ago
DELIMITER $$
DROP FUNCTION IF EXISTS time_ago;
CREATE FUNCTION time_ago (ts datetime)
RETURNS varchar(255)
DETERMINISTIC
BEGIN
DECLARE utx INT SIGNED DEFAULT 1;
DECLARE nowutx INT SIGNED DEFAULT 1;
DECLARE dif INT SIGNED DEFAULT 1;
DECLARE method varchar(255);
DECLARE cnt varchar(255);
DECLARE plural tinyint(11);
DECLARE future tinyint(11);
SET utx := UNIX_TIMESTAMP(ts);
SET nowutx := UNIX_TIMESTAMP(NOW());
SET future := utx > nowutx;
SET dif := IF(future, utx - nowutx, nowutx - utx);
SET method := IF(dif < 60, 'Second', IF(
dif < (60 * 60), 'Minute', IF(
dif < (60 * 60 * 24), 'Hour', IF(
dif < (60 * 60 * 24 * 7), 'Day' , IF(
dif < (60 * 60 * 24 * 365), 'Week', 'Year')))));
SET cnt := IF(dif < 60, dif, IF(
dif < (60 * 60), floor(dif / 60), IF(
dif < (60 * 60 * 24), floor(dif / (60 * 60)), IF(
dif < (60 * 60 * 24 * 7), floor(dif / (60 * 60 * 24)) , IF(
dif < (60 * 60 * 24 * 365) , floor(dif / (60 * 60 * 24 * 7)), floor(dif / (60 * 60 * 24 * 365)))))));
SET plural := cnt != 1;
return CONCAT(IF(future, 'In ', ''), cnt, ' ',method, IF(plural, 's', '') , IF(future, ' From Now', ' Ago'));
END$$
DELIMITER ;
It is used like this
SELECT time_ago(date_ordered) time_ago FROM orders LIMIT 1
And the result looks like this:
time_ago
22 Weeks Ago
EDIT:
I have modified this answer to offer an improved version of this function: the new version uses DECLARE instead of setting session variables.
来源:https://stackoverflow.com/questions/7323883/sql-query-that-displays-time-ago-dates-like-one-week-ago-two-weeks-ago