Question

I have the following MySQL Query:

SELECT concat_ws('/', exp_month, exp_year) as exp_date 
FROM `cc_info`
WHERE concat_ws('/', exp_month, exp_year) <= '05/12'

The query is pulling back results in the future as well as in the past. Any idea what I am doing wrong here?

Answer 1

You are comparing strings in lexicographical order, and the month comes before the year. If you put the year before the month, then they will be in the correct order:

SELECT concat_ws('/', exp_year, exp_month) as exp_date 
FROM `cc_info`
WHERE concat_ws('/', exp_year, exp_month) <= '12/05'