Question

Which query retrieves all records from TableA that have

Q: Answer-Which query retrieves all records from TableA that have no corresponding records in TableB?

A LEFT JOIN retrieves all records from TableA and the matching records from TableB. If no match exists, the TableB fields are NULL. Filtering on TableB.id IS NULL ensures only those records from TableA with no match in TableB are selected. Why Other Options Are Incorrect 1. INNER JOIN Retrieves only matching records, not unmatched ones. 2. RIGHT JOIN Retrieves unmatched records from TableB, not TableA. 3. FULL OUTER JOIN Includes all unmatched records but does not isolate TableA exclusively. 4. NOT IN Functional but less efficient than LEFT JOIN.

no corresponding records in TableB?

A SELECT * FROM TableA INNER JOIN TableB ON TableA.id = TableB.id;

B SELECT * FROM TableA LEFT JOIN TableB ON TableA.id = TableB.id WHERE TableB.id IS NULL;

C SELECT * FROM TableA RIGHT JOIN TableB ON TableA.id = TableB.id WHERE TableA.id IS NULL;

D SELECT * FROM TableA FULL OUTER JOIN TableB ON TableA.id = TableB.id;

E SELECT * FROM TableA WHERE id NOT IN (SELECT id FROM TableB);

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Which query retrieves all records from TableA that have

Solution