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Oracle Database 23ai SQL Associate Sample Questions:

1. How can a synonym benefit database design?

A) It provides a consistent reference to database objects, even if their underlying names change.
B) It allows the renaming of columns in a table.
C) It improves query execution time.
D) It enforces constraints on table columns.

2. What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;

A) 15.67
B) 15.68
C) 15.678
D) 15.6

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

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

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

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

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

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

Solutions: