第 51 题 (多选题)： View the Exhibit and examine the description of the tables You execute this SQL statement Which three statements are true.

A. The sales table has five foreign keys. B. The statement will execute successfully and a new row will be inserted into the SALES table. C. A product can have a different UNIT_PRICE at different times. D. A customer can exist in many countries. E. The statement will fail if a row already exists in the SALES table for product 23. F. The statement will fail because a subquery may not be contained in a VALUES clause 显示答案