From m204wiki
(Redirected from $UPDOVAL)
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

The $UPDOVAL function is used in conjunction with the ON FIELD CONSTRAINT CONFLICT unit.

If $UPDOVAL is invoked from an ON FCC unit following the detection of an AT-MOST-ONE field-level constraint conflict, it returns the value of the original field occurrence which is causing the constraint violation. At all other times, $UPDOVAL returns a null string. The $UPDOVAL function takes no arguments.