Progress/400
Product Guide
Legacy Support and the Progress Unknown Value
Progress/400 provides backward compatibility to support prior DB2/400 translations of the legacy unknown value. With Version 9 of the DataServer, you can convert data definitions that used the legacy unknown value to use the SQL NULL value or you can continue to use the legacy unknown value. This appendix describes the following topics related to SQL NULL and the legacy unknown value support:
Progress recommends the use of DB2/400 SQL NULL capability
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