ADD MONTHS


 * ADD_MONTHS
 * next_month
 * EDATE
 * DATE_ADD


 * test set
 * Common
 * 2013-12 → 2014-01
 * 2011-01-28 → 2011-02-28
 * 2013-12-05 → 2014-01-05


 * TYPE 1 (locked in month, Same as EDATE)
 * 2011-01-31 → 2011-02-28


 * TYPE 2 (+number of days in month)
 * 2011-01-31 → 2011-03-03

Bash

 * Type 2

Excel

 * TYPE 1


 * TYPE 2

PHP

 * TYPE 1


 * TYPE 2

MySQL

 * TYPE 1

Oracle

 * TYPE 1