How to use a Voyager Global Data Change scan job to identify records that do not have a certain MARC field

Question

How do I run a GDC scan job to identify records that do not have a certain MARC field (for example the 946)?

Answer

Add the following two scan rule sets to a single scan rule set group:

1. Create a scan rule with a consequence of Include, which is "always true" (for example use "MARC Control Field Exists" for Field LDR).
2. Create a scan rule with the condition "MARC Field/Subfield Exists" for (for example) Field 946, and a consequence of Exclude. 

This will put the BIB IDs of the records without a 946 field in your record set.

Additional Information

Frequently customers want to use this functionality in GDC to then add a new MARC field and subfield to the records in the record set.  See: Overview of using Voyager Global Data Change to add a new MARC field and subfield

See also: GDC: Scan to Exclude does not add records to set

• Article last edited: 13-May-2020