Arithmetic operators allow you to perform calculations.
expression + expression Addition. If either expression is NULL, the result is NULL.
expression  expression Subtraction. If either expression is NULL, the result is NULL.
 expression Negation. If the expression is NULL, the result is NULL.
expression * expression Multiplication. If either expression is NULL, the result is NULL.
expression / expression Division. If either expression is NULL or if the second expression is 0, the result is NULL.
expression % expression Modulo finds the integer remainder after a division involving two whole numbers. For example, 21 % 11 = 10 because 21 divided by 11 equals 1 with a remainder of 10. If either expression is NULL, the result is NULL.
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