IBM Extension
IBM Extension

NULL-KEY-MAP IS Phrase

Specifies the null key map of the record for the START operation according to the value specified for identifier-2. Identifier-2 must be a boolean or alphanumeric item.

Identifier-2 can be subscripted or reference modified.

If the file has alternate keys, identifier-2 is associated with the null key map of the current key of reference.

This phrase can only be specified for a file with the ALWNULL attribute and a device type of DATABASE specified in the ASSIGN clause. If one of the key fields is null-capable and the NULL-KEY-MAP phrase is not used, a null-key-map with all boolean zeroes is used.

End of IBM Extension
End of IBM Extension