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Oracle Database 23ai SQL Associate Sample Questions:

1. Which clause in a SQL SELECT statement is used to define the columns to be retrieved?

A) FROM
B) WHERE
C) GROUP BY
D) SELECT

2. What is the default order of evaluation when multiple SET operators are used in a query?

A) UNION, INTERSECT, MINUS
B) INTERSECT, UNION, MINUS
C) UNION, MINUS, INTERSECT
D) INTERSECT, MINUS, UNION

3. What is the purpose of the MERGE statement in SQL?

A) To delete duplicate rows from a table
B) To join two tables into one
C) To update existing rows or insert new rows in a target table
D) To combine the results of two queries

4. Which function returns the current system date and time in the database session's time zone?

A) LOCAL_TIME
B) CURRENT_TIMESTAMP
C) SYSTEM_TIME
D) SYSDATE

5. What will the following SQL statement output?
SELECT first_name || ' ' || last_name AS full_name FROM employees;

A) Concatenated first and last names without spaces
B) A syntax error
C) Only the first names of employees
D) Concatenated first and last names with spaces in between

Solutions: