CREATE FUNCTION getDateDifferenceString(date1 DATE, date2 DATE)
RETURNS VARCHAR(30)
RETURN CONCAT(
@years := TIMESTAMPDIFF(YEAR, date1, date2),
IF (@years = 1, ' year, ', ' years, '),
@months := TIMESTAMPDIFF(MONTH, DATE_ADD(date1, INTERVAL @years YEAR), date2),
IF (@months = 1, ' month, ', ' months, '),
@days := TIMESTAMPDIFF(DAY, DATE_ADD(date1, INTERVAL @years * 12 + @months MONTH), date2),
IF (@days = 1, ' day', ' days')
);
/* USAGE
mysql> SELECT getDateDifferenceString('2006-03-01',NOW()) MyExperience;
+----------------------------+
| MyExperience |
+----------------------------+
| 5 years, 5 months, 23 days |
+----------------------------+
1 row in set, 1 warning (0.00 sec)
*/
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