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【单项选择题】

What is true about joining tables through an equijoin?（）

A、A. You can join a maximum of two tables through an equijoin.

B、B. You can join a maximum of two columns through an equijoin.

C、C. You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.

D、D. To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

E、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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