sql - How to SUM two first character in MySQL? -


is possible sum first 2 characters using substr , group by in mysql?
such :

select sum(substr(period, 1,2) table group period

i have tried these sql. didn't effect because of using group by. result of these query sum of period value.

try (if want sum 2 first characters):

select     sum(cast(substr(period, 1, 1)) int) + cast(substr(period, 2, 1)) int))     table group     period

or

select     sum(cast(substr(period, 1, 2) int))      table group     period

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