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Questions about the "find" method in "Data" class

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As is described in the comment before method body, the parameter of the method, toMatch, is the record number field. But there is no such thing as a "record number" field (1, 2, ...24) in the database record. The first field in a record is the "Fright Number" field, which has the value of "SA001", "PA008", "RA981" ...
What is wrong with my thinking?
Esenih Camai
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What about the "implied" Record Number? 1st record is #1, 2nd is #2 etc?
BTW Orcale has several similar concepts. One is ROWNUM of the results on a cursor.
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