How to subtract Ne value?

M

manfi312018-06-12 18:09:32

MySQL

manfi31, 2018-06-12 18:09:32

Suppose there is a row in the table with a value of 30, how to subtract 1.2 from it ... etc.
I know how to add it, but I can’t do it how to take it away. searched on google found nothing.

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SagePtr, 2018-06-12
@SagePtr

Addition was passed in school, but subtraction was not?)

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