Oracle 1Z0-071 Database SQL Practice Exam
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Oracle 1Z0-071 Oracle Database SQL
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Test Your Knowledge of Oracle 1Z0-071 Database SQL
Question #1
A developer is writing a query to retrieve employee names and salaries from a table.
Which clause should be used to sort the results by salary in descending order?
A) ORDER BY salary ASC
B) GROUP BY salary DESC
C) ORDER BY salary DESC
D) SORT BY salary DESC
Solution
Correct answers: C – Explanation:
ORDER BY salary DESC correctly sorts results in descending order. ASC is ascending, GROUP BY is for aggregation, and SORT BY is invalid in SQL.
Question #2
A user needs to retrieve all employees whose department ID is either 10 or 20.
Which WHERE clause is appropriate?
A) WHERE department_id = 10 AND 20
B) WHERE department_id IN (10, 20)
C) WHERE department_id BETWEEN 10 AND 20
D) WHERE department_id = 10 OR 20
Solution
Correct answers: B – Explanation:
IN (10, 20) matches either value. BETWEEN includes all values in range, and OR 20 is syntactically incorrect.
Question #3
A query returns duplicate rows.
Which keyword removes duplicates from the result set?
A) DISTINCT
B) UNIQUE
C) FILTER
D) REMOVE
Solution
Correct answers: A – Explanation:
DISTINCT eliminates duplicate rows. UNIQUE is for constraints, FILTER and REMOVE are invalid.
Question #4
A table contains NULL values in the salary column.
Which function replaces NULL with a default value?
A) NVL
B) COALESCE
C) IFNULL
D) ISNULL
Solution
Correct answers: A – Explanation:
NVL replaces NULL with a specified value in Oracle SQL. COALESCE works similarly but supports multiple arguments.
Question #5
A user wants to count the number of employees in each department.
Which clause is required to group results by department?
A) GROUP BY
B) ORDER BY
C) HAVING
D) PARTITION BY
Solution
Correct answers: A – Explanation:
GROUP BY aggregates data by department. ORDER BY sorts, HAVING filters groups, PARTITION BY is for analytics.
Question #6
A query uses a subquery in the SELECT clause.
What is the purpose of a scalar subquery?
A) To return multiple rows
B) To return a single value
C) To join two tables
D) To filter rows
Solution
Correct answers: B – Explanation:
Scalar subqueries return a single value. Multiple rows cause errors. Joins and filters are separate operations.
Question #7
A developer needs to retrieve the current system date.
Which function should be used?
A) SYSDATE
B) CURRENT_DATE
C) GETDATE
D) SORT BY salary DESC
Solution
Correct answers: A – Explanation:
SYSDATE returns the current date in Oracle. CURRENT_DATE is timezone-aware, GETDATE is SQL Server, TODAY is invalid.
Question #8
A user wants to combine results from two SELECT statements.
Which operator should be used to include all rows from both queries?
A) UNION
B) UNION ALL
C) INTERSECT
D) MINUS
Solution
Correct answers: C – Explanation:
ORDER BY salary DESC correctly sorts results in descending order. ASC is ascending, GROUP BY is for aggregation, and SORT BY is invalid in SQL.
Question #9
A query uses a JOIN between employees and departments.
Which JOIN returns all employees, even if they have no department?
A) INNER JOIN
B) LEFT OUTER JOIN
C) RIGHT OUTER JOIN
D) FULL OUTER JOIN
Solution
Correct answers: B – Explanation:
LEFT OUTER JOIN returns all rows from the left table (employees), even if no match in departments.
Question #10
A user wants to filter rows based on an aggregate function.
Which clause should be used?
A) WHERE
B) HAVING
C) GROUP BY
D) ORDER BY
Solution
Correct answers: B – Explanation:
HAVING filters aggregated results. WHERE filters before aggregation. GROUP BY groups, ORDER BY sorts.
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