Tables in VMNetDB

• A table definition in the schema represents a set of rows that are instances of its contained record type and a set of columns that contain attribute values.

• This table definition can be converted by chgen to a ‘C’ struct declaration and threaded lists for its relatinships,.

• Data types available for table columns include primary and foreign key, int, float, word, text.

• A Data Structure Diagram (DSD) is an ERA diagram after all M:N relationships have been converted to Associative Entity tables.
  • A DSD can be drawn by any drawing tool and a corresponding chgen input schema.sch file can be created using any text editor.

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