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Oracle Database 23ai SQL Associate Sample Questions:

1. What happens if a DELETE statement is executed without a WHERE clause?

A) An error is raised.
B) No rows are deleted.
C) All rows in the table are deleted.
D) Only the first row is deleted.

2. What is a subquery in SQL?

A) A query inside another query
B) A query used to create a table
C) A query that combines data from multiple tables
D) A query used for joining two or more tables

3. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?

A) HAVING
B) WHERE
C) FROM
D) SET

4. Which SQL statement is used to create a table?

A) INSERT
B) ALTER TABLE
C) ADD TABLE
D) CREATE TABLE

5. What is the difference between UNION and UNION ALL?

A) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
B) UNION includes all rows, while UNION ALL removes duplicates.
C) UNION combines columns, while UNION ALL combines rows.
D) UNION works with subqueries, while UNION ALL does not.

Solutions: