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What is true about joining tables through an equijoin?（）
A:You can join a maximum of two tables through an equijoin.
B:You can join a maximum of two columns through an equijoin.
C:You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
D:To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.
E:You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.

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出自：Oracle认证

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