BIGINT
Largest integer type, supporting range of whole numbers from
-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (0 to
18,446,744,073,709,551,615 unsigned). BIGINT
has
some issues when you perform arithmetic on unsigned values. MySQL
performs all arithmetic using signed BIGINT
or
DOUBLE
values. You should therefore avoid
performing any arithmetic operations on unsigned
BIGINT
values greater than
9,223,372,036,854,775,807. If you do, you may end up with imprecise
results.