Null Command
The null command is a THEN or ELSE command that is not followed by a command continuation character. If THEN or ELSE is not followed by either a continuation character or by a command in the same record, the THEN or ELSE results in no action. The null command supports an ELSE command that balances an IF-THEN-ELSE command sequence, and allows null THEN commands.
If you want to indicate a null ELSE command, say:
ELSEIf you want to indicate a null THEN command, say:
IF ... THEN
ELSE ...Use the null command to indicate that no action is to be taken if the IF clause is satisfied (a null THEN command) or if the IF clause is not satisfied (a null ELSE command).