SQL$HELP72.HLB  —  Errors  SQL_ERRORS, NOCORRCOL
  There are no matching columns in the corresponding select lists

  Explanation:  You specified a UNION CORRESPONING query
  expression in which there were no corresponding columns in the
  two select lists.  There must be at least one column which
  matches.

  User Action:  Either omit the CORRESPONDING keyword, or specify
  at least one pair of columns which match.
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