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Which SQL statement is used to retrieve data from multiple tables based on a condition?
A. JOIN
B. UNION
C. GROUP BY
D. ORDER BY
Answer: JOIN
Which SQL function is used to calculate the sum of values in a numeric column?
A. SUM()
B. COUNT()
C. AVG()
D. MAX()
Answer: SUM()
Which database operation is used to remove records from a table?
A. DELETE
B. REMOVE
C. DROP
D. CUT
Answer: DELETE
Which of the following is NOT a NoSQL database?
A. PostgreSQL
B. Couchbase
C. Neo4j
D. Cassandra
Answer: PostgreSQL
In SQL, which statement is used to change the structure of an existing table?
A. ALTER
B. MODIFY
C. UPDATE
D. CHANGE
Answer: ALTER
What does ‘SQL’ stand for?
A. Structured Query Language
B. Standard Query Logic
C. Simple Query Language
D. System Query Language
Answer: Structured Query Language
Which of the following ensures data integrity by preventing duplicate entries in a column?
A. Unique constraint
B. Foreign key
C. Check constraint
D. Index
Answer: Unique constraint
Which SQL clause is used to combine rows from two or more tables?
A. JOIN
B. UNITE
C. COMBINE
D. MERGE
Answer: JOIN
Which of the following properties ensures that a transaction is processed completely or not at all?
A. Atomicity
B. Durability
C. Isolation
D. Consistency
Answer: Atomicity