Errata
- p. 116, 1st paragraph: "The direct mapping maps every relation type to a table and every role to a row." should be "...and every role to a column.".
- p. 117, 1st paragraph: "Each table has a row with a foreign key to the other table. Each of these rows is called sibling row of the other." should be "column"/"columns" instead of "row"/"rows".