
>>-NOP--;------------------------------------------------------><
NOP is a dummy instruction that has no effect. It can be useful
as the target of a THEN or ELSE clause:
Example:
Select
when a=c then nop /* Do nothing */
when a>c then say 'A > C'
otherwise say 'A < C'
end
Note:
Putting an extra semicolon instead of the NOP
would merely insert
a null clause, which would be ignored.
The second WHEN clause
would be seen as the first instruction
expected after the THEN, and would, therefore, be
treated as a syntax error.
NOP is a true instruction, however, and is, therefore, a valid
target for the THEN clause.