Discussion
The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T WHERE CUSTOMER_T. CUSTOMER_ID = ORDER_T. CUSTOMER_ID
Answer: A
Correct answer: Equi-join
The join condition tests two columns for equality, which is what makes it an equi-join, and both CUSTOMER_ID columns appear in the select list. A natural join would have dropped one of them; the presence of the duplicate is the distinguishing feature.
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