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  • PowerExchange for CDC and Mainframe 10.5
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  1. Preface
  2. Introduction to PowerExchange
  3. DBMOVER Configuration File
  4. Netport Jobs
  5. PowerExchange Message Logs and Destination Overrides
  6. SMF Statistics Logging and Reporting
  7. PowerExchange Security
  8. Secure Sockets Layer Support
  9. PowerExchange Alternative Network Security
  10. PowerExchange Nonrelational SQL
  11. PowerExchange Globalization
  12. Using the PowerExchange ODBC Drivers
  13. PowerExchange Datatypes and Conversion Matrix
  14. Appendix A: DTL__CAPXTIMESTAMP Time Stamps
  15. Appendix B: PowerExchange Glossary

Reference Manual

Reference Manual

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NULL Comparison

NULL Comparison

This comparison is testing a column for being NULL or NOT NULL. It is treated as though it is less than any other possible value therefore it cannot be equal to anything other than another NULL column.
Example:
col1 IS  [NOT] NULL