How to Put a Null Value in a Field

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The only predefined method for adding .NULL. to a field manually is by using the CTRL+0 (control+zero) key combination. The zero key must be the zero key on the main keyboard, not the zero key on the numeric keypad. In Visual FoxPro for Macintosh, you must use the zero on the numeric keypad. The zero on the main keypad does not work.

If you'd prefer to use another key combination, use the ON KEY LABEL command. For Example, you could use the following command when interacting with a BROWSE:

   ON KEY LABEL F12 DO ADD_NULL
				

After creating a procedure or program called ADD_NULL that contains this code:

   ON KEY LABEL F12                && Temporarily turn off routine.
   REPLACE (SYS(18)) WITH .NULL.   && Replace current field with .NULL.
   ON KEY LABEL F12 DO ADD_NULL    && Turn On Key Label back on.