Add year to column before compare in SQL query

Question

I am querying a MySQL database and I need to add a year to a column (of type date) before the compare operation.

I would expect is to look something like this:

SELECT count(*) AS count 
  FROM users 
 WHERE renewed + 1 year < '2009-12-12'

Answer 1

Use:

SELECT COUNT(*) AS count 
  FROM USERS u 
 WHERE DATE_ADD(u.renewed, INTERVAL 1 YEAR) < '2009-12-12'

Reference:

• DATE_ADD

Answer 2

您可以使用mysql DATE_ADD函数 ：

DATE_ADD(renewed, INTERVAL 1 YEAR)