mysql - Date difference using months -

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i have month names in database, eg. tomonth , frommonth. data stored 'jan', 'feb' etc.

what have difference between tomonth , frommonth?

try below query

select (tomonth-frommonth) monthdiff ( select case when `frommonth` = 'jan' 1     when frommonth = 'feb' 2      when frommonth = 'mar' 3     when frommonth = 'apr' 4      when frommonth = 'may' 5      when frommonth = 'jun' 6      when frommonth = 'jul' 7      when frommonth = 'aug' 8      when frommonth = 'sep' 9      when frommonth = 'oct' 10      when frommonth = 'nov' 11      when frommonth = 'dec' 12     end frommonth,  ( case when tomonth = 'jan' 1    when tomonth = 'feb' 2      when tomonth = 'mar' 3     when tomonth = 'apr' 4      when tomonth = 'may' 5      when tomonth = 'jun' 6      when tomonth = 'jul' 7      when tomonth = 'aug' 8      when tomonth = 'sep' 9      when tomonth = 'oct' 10      when tomonth = 'nov' 11      when tomonth = 'dec' 12     end ) tomonth table)

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