You can use (-) arithmetic operator to subtract two numbers, or subtract the number of days from a DATE value.
Syntax:
expr - expr
When you subtract two integer values the result of the operation also has an integer value.
Example:
| Expression | Result | Result Type |
| 3 - 1 | 2 | Integer |
When you subtract an integer from a DATE value, PL/HQL subtracts the number of days from the DATE and the result of the operation is a DATE value.
Example:
| Expression | Result | Result Type |
| DATE '2015-01-01' - 1 | DATE '2014-12-31' | DATE |