Column that is the difference between values of same column perday

Question

My table is as follows:

Balance          Value 1        Value2          Date        Daily Change (Expected)  
8                8,648,668.60   12,620,390.51   3/2         


        

Answer 1

You can use a left join:

select t.*,
       (t.balance - tprev.balance) as daily_change
from `table` t left join
     `table` tprev
     on t.date = tprev.date  + interval 1 day;