Question

How can add 1 year to a date value stored in the DB as varchar (format: “2011.03”)?

I’m trying with this, but returns NULL 🙁

DATE_FORMAT(DATE_ADD(STR_TO_DATE('2011.03', '%Y.%m'), INTERVAL 1 YEAR),'%Y.%m')

Thank you very much!

edit.: this is the query i want to use in:

SELECT DISTINCT column FROM table WHERE column  BETWEEN '2011.03' AND DATE_FORMAT(DATE_ADD(STR_TO_DATE('2011.03', '%Y.%m'), INTERVAL 1 YEAR),'%Y.%m') ORDER BY column  DESC

(“2011.03” is a parameter value and comes outside)

Answer 1

What you are trying is giving correct result

Try :

SELECT DATE_FORMAT(DATE_ADD(STR_TO_DATE('2011.03', '%Y.%m'), INTERVAL 1 YEAR),'%Y.%m')

it’s giving 2012.03.

Edit:

You can use below trick to make it workable in mysql version > 5.0

Add month with date because in Mysql version > 5.0 str_to_date() sometimes would return NULL if the %D format specifier was not the last specifier in the format string input.

Try below:

 SELECT DATE_FORMAT(DATE_ADD(STR_TO_DATE('2011.03.01', '%Y.%m.%d'), INTERVAL 1 YEAR),'%Y.%m')