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Oracle Database 23ai SQL Associate Sample Questions:
1. 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
2. What happens when a unique index is created on a table column?
A) The column can only contain NULL values.
B) The column values are automatically encrypted.
C) The column data type is converted to a primary key.
D) The column cannot contain duplicate values.
3. Which type of join retrieves only the rows with matching values in both tables?
A) CROSS JOIN
B) OUTER JOIN
C) INNER JOIN
D) NATURAL JOIN
4. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?
A) SET
B) HAVING
C) FROM
D) WHERE
5. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;
A) The current date in the default system format
B) The time part of the current date
C) The current date in the format 'DD-MM-YYYY'
D) An error
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: A | Question # 5 Answer: C |
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