Advanced SQL MCQs
Practice free Advanced SQL multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 31 questions — no login required.
Question 29hard
With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.
Question 30easy
What type of join is needed when you wish to include rows that do not have matching values?
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Question 31easy
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 ;