Language basics / Expressions |
An interval evaluates to an INTERVAL data type.
MAIN DEFINE r, c INTERVAL HOUR TO MINUTE LET c = "12:45" LET r = c + ( DATETIME(14:02) HOUR TO MINUTE - DATETIME(10:43) HOUR TO MINUTE ) END MAIN
If an interval expression includes an operand whose value is not an interval data type, the runtime system attempts to convert the value to an interval value according to the data conversion rules.
If an element of an integer expression is NULL, the expression is evaluated to NULL.