Chapter 3: Combining Tables Horizontally Using PROC SQL

  1. Correct answer: a
    A Cartesian product is returned when join conditions are not specified in a PROC SQL join. In a Cartesian product, each row from the first table is combined with every row from the second table.
  2. Correct answer: b
    This PROC SQL query is an inner join. It combines the rows from the first table that match rows from the second table, based on the matching criteria specified in the WHERE clause. Columns are not overlaid, so all columns from the referenced tables (including any columns with duplicate names) are displayed. Any unmatched rows from either table are not displayed.
  3. Correct answer: d
    This PROC SQL query is a right outer join, which retrieves all ...

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