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Oracle Database SQL Sample Questions (Q254-Q259):

NEW QUESTION # 254
Which two statements will return the names of the three employees with the lowest salaries?

A. SELECT last_ name, salary
FBOM employees
WEERE
ORDER BY SELECT
ROINUM <= 3
salary FROM
employees);
B. SELECT last_ name, salary
FROM employees
FETCH FIRST 3 ROWS ONLY
ORDER BY salary;
C. SELECT last_ name, salary
FROM employees
WHERE ROWNUM <=3
ORDER BY salary
D. SELECT last_ name, salary
FROM
(SELECT" FROM employees ORDER BY salary)
WHERE ROWNUM <=3
E. SELECT last name, salary
FROM employees
ORDER BY salary
FETCE FIRST 3 RONS ONLY;

Answer: B,D

Explanation:
A: This statement is correct. It orders the employees by salary and fetches the first 3 rows.
B: This statement has a typo with "FETCE" and "RONS" which should be "FETCH" and "ROWS". Hence, it will not execute successfully.
C: This statement will not execute successfully due to syntactical errors and incorrect use of the ORDER BY clause.
D: This statement is correct. It uses a subquery to order employees by salary and then limits the results to the first 3 using the ROWNUM pseudo-column.
E: This statement will not execute successfully because ROWNUM is evaluated before the ORDER BY clause, so it would return the first 3 rows based on the table's natural order, not the lowest salaries.
The behavior of ROWNUM and the FETCH FIRST syntax are explained in the Oracle Database SQL Language Reference 12c.

NEW QUESTION # 255
You want to write a query that prompts for two column names and the WHERE condition each time It is executed in a session but only prompts for the table name the first time it is executed. The variables used in your query are never undefined in your session . Which query can be used?

A. SELECT &&col1,&&col2
FROM &table
WHERE &&condition= &&cond;
B. SELECT'&co11','&&co12'
FROM &table
WHERE'&&condition' ='&cond';
C. SELECT &col1, &col2
FROM &&table
WHERE &condition;
D. SELECT &col1, &col2
FROM "&table"
WHERE &condition;
E. SELECT&&col1, &&col2
FROM &table
WHERE &&condition;

Answer: C

Explanation:
The scenario requires prompting for column names and WHERE condition each time the query is executed, but only prompting for the table name once. This behavior is achievable through the use of substitution variables in SQL*Plus or SQL Developer:
* A.
SELECT &col1, &col2 FROM &&table WHERE &condition;
This query uses & for columns and condition, which will prompt every time the query is run. &&table will prompt for the table name the first time and reuse the same value in the same session without re-prompting.
Options B, C, D, and E use incorrect syntax or variable types, leading to various errors or undesired behaviors, such as not maintaining the value of the table name across executions or incorrect usage of single quotes and comparison in SQL.

NEW QUESTION # 256
Examine the description of the EMPLOYEES table:

Which statement will fail?

A. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 HAVING COUNT(*) >= 3
GROUP BY department_id;
B. SELECT department_id, COUNT(*)
FROM employees
WHERE department_id <> 90 GROUP BY department_id
HAVING COUNT(*) >= 3;
C. SELECT department_id, COUNT (*)
FROM employees
HAVING department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;
D. SELECT department_id, COUNT (*)
FROM employees
WHERE department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;

Answer: D

Explanation:
The statement that will fail is B. In Oracle SQL, the WHERE clause cannot contain aggregate functions directly. The HAVING clause is used instead to apply conditions that involve aggregates, but it is applied after the GROUP BY clause.
A). While the HAVING clause is used before the GROUP BY clause which is not standard SQL syntax, Oracle SQL may still execute it successfully due to its flexibility in syntax.
B). This statement will fail because it uses an aggregate function, COUNT(*), in the WHERE clause, which is not allowed. The correct approach is to use the HAVING clause to filter the results of aggregate functions after the GROUP BY clause.
C). This statement is correct; it places the HAVING clause after the GROUP BY clause, applying the filter on the aggregated count.
D). This is a correctly constructed statement with the WHERE clause filtering individual records before grouping, and the HAVING clause filtering groups based on the aggregate function.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "WHERE Clause"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "HAVING Clause"

NEW QUESTION # 257
Which two are true about self joins?

A. They are always equijoins.
B. They require table aliases.
C. They require the NOT EXISTS operator in the join condition.
D. They have no join condition.
E. They require the EXISTS opnrator in the join condition.
F. They can use INNER JOIN and LEFT JOIN.

Answer: B,F

NEW QUESTION # 258
Which three statements are true regarding group functions? (Choose three.)

A. They can be used on only one column in the SELECT clause of a SQL statement.
B. They can be used on columns or expressions.
C. They can be used along with the single-row function in the SELECT clause of a SQL statement.
D. They can be used only with a SQL statement that has the GROUP BY clause.
E. They can be passed as an argument to another group function.

Answer: B,C,E

Explanation:
Explanation
References:
https://www.safaribooksonline.com/library/view/mastering-oracle-sql/0596006322/ch04.html

NEW QUESTION # 259
......

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Oracle Database SQL Sample Questions (Q254-Q259):

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