Primary key maybe.

Something that helps you identify the row.

You could also narrow down the problem if above isn't working for you.

Select column from xx

where column between 1 and 100.

if it doesnt fail continue to between 100 and 1000 until you narrow it down.

In the end you will find the row causing the problem and then run an update

statment on that row that fixes the out of range value.