Which two statements are true regarding the USING clause in table joins?(Choose two.)

Question

Options

• AIt can be used to join a maximum of three tables.
• BIt can be used to restrict the number of columns used in a NATURAL join.
• CIt can be used to access data from tables through equijoins as well as nonequijoins.
• DIt can be used to join tables that have columns with the same name and compatible data types.

• A
  6% (2)
• B
  82% (27)
• C
  12% (4)

Explanation

NATURAL JOIN operation A NATURAL JOIN is a JOIN operation that creates an implicit join clause for you based on the common columns in the two tables being joined. Common columns are columns that have the same name in both tables. If the SELECT statement in which the NATURAL JOIN operation appears has an asterisk () in the select list, the asterisk will be expanded to the following list of columns (in this order): All the common columns Every column in the first (left) table that is not a common column Every column in the second (right) table that is not a common column An asterisk qualified by a table name (for example, COUNTRIES.) will be expanded to every column of that table that is not a common column. If a common column is referenced without being qualified by a table name, the column reference points to the column in the first (left) table if the join is an INNER JOIN or a LEFT OUTER JOIN. If it is a RIGHT OUTER JOIN, unqualified references to a common column point to the column in the second (right) table. TableExpression NATURAL [ { LEFT | RIGHT } [ OUTER ] | INNER ] JOIN { TableViewOrFunctionExpression | ( TableExpression ) } If the tables COUNTRIES and CITIES have two common columns named COUNTRY and COUNTRY_ISO_CODE, the following two SELECT statements are equivalent: SELECT * FROM COUNTRIES NATURAL JOIN CITIES SELECT * FROM COUNTRIES JOIN CITIES USING (COUNTRY, COUNTRY_ISO_CODE)

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