Question

I have 3 columns a,b,c. A = 3 B =4, I’m trying to perform an update statement that can handle negative. For example in this case i should get -1, but instead I get the error Out of range value for column ‘C’ at row 1. All columns are ints.

Any suggestions would be awesome!

update tbl
set c = a - b
where uniqueID = 49

Answer 1

Check column C definition, it might be set as UNSIGNED.

EDIT

Check definition of all columns involved in the calculation. If any of them is marked as UNSIGNED, then all calculations will be done usign UNSGINED arithmetic with can result in the Out of range value error.