Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
SELECT * FROM A, B WHERE A.id = B.id;
SELECT A.name, B.price FROM A INNER JOIN B ON A.id = B.id;
SELECT * FROM A + B;
SELECT A.*, B.* FROM A JOIN B;
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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.