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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;

A) Increase the salary of all employees by 10%
B) Decrease the salary of employees in department 10 by 10%
C) Increase the salary of employees in department 10 by 10%
D) Set the salary to 1.1 for employees in department 10

2. What is a subquery in SQL?

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

3. Which of the following is true about foreign key constraints in SQL?

A) They enforce the uniqueness of values in a column.
B) They ensure that a column only contains NULL values.
C) They define a relationship between two tables.

4. How is the LOCALTIMESTAMP function different from CURRENT_TIMESTAMP?

A) Both functions are identical in output.
B) LOCALTIMESTAMP omits time zone information, while CURRENT_TIMESTAMP includes it.
C) LOCALTIMESTAMP does not include fractional seconds, while CURRENT_TIMESTAMP does.
D) LOCALTIMESTAMP returns only the date, while CURRENT_TIMESTAMP returns the date and time.

5. Which SQLPlus command displays defined substitution variable values?

A) LIST
B) SHOW
C) VERIFY
D) DEFINE

Solutions: