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Oracle Database SQL Sample Questions (Q211-Q216):

NEW QUESTION # 211
Examine this query:
SELECT employee_id,first_name,salary
FROM employees
WHERE hire_date>'&1';
Which two methods should you use to prevent prompting for a hire date value when this query is executed?

A. Store the query in a script and pass the substitution value to the script when executing it.
B. Use the DEFINE command before executing the query.
C. Use the UNDEFINE command before executing the query.
D. Execute the SET VERIFY OFF command before executing the query.
E. Replace'&1' with'&&1' in the query.
F. Execute the SET VERIFY ON command before executing the query.

Answer: B,D

Explanation:
In Oracle SQL, substitution variables (&1) can be used to dynamically replace a value in a SQL statement at runtime. To avoid being prompted for a value when executing a query that includes a substitution variable:
A . Use the DEFINE command before executing the query: By setting a value for a substitution variable using the DEFINE command, Oracle will use this value instead of prompting the user for input.
D . Execute the SET VERIFY OFF command before executing the query: The SET VERIFY OFF command suppresses the prompt for substitution variables by turning off the verification feature. This makes Oracle use the currently defined value for the variable.
Reference:
Oracle Database SQL Language Reference 12c, particularly the sections on substitution variables, the DEFINE command, and the SET command.

NEW QUESTION # 212
View the Exhibit and examine the structure of the CUSTOMERS and CUST_HISTORY tables.

The CUSTOMERS table contains the current location of all currently active customers.
The CUST_HISTORY table stores historical details relating to any changes in the location of all current as well as previous customers who are no longer active with the company.
You need to find those customers who have never changed their address.
Which SET operator would you use to get the required output?

A. INTERSECT
B. MINUS
C. UNION ALL
D. UNION

Answer: B

NEW QUESTION # 213
View the Exhibit and examine the structure of the PRODUCTS table.

You must display the category with the maximum number of items.
You issue this query:

What is the result?

A. It generates an error because = is not valid and should be replaced by the IN operator.
B. It executes successfully and gives the correct output.
C. It executes successfully but does not give the correct output.
D. It generate an error because the subquery does not have a GROUP BY clause.

Answer: D

NEW QUESTION # 214
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
WHERE department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;
D. SELECT department_id, COUNT (*)
FROM employees
HAVING department_ id <> 90 AND COUNT(*) >= 3
GROUP BY department_id;

Answer: C

NEW QUESTION # 215
Examine this statement:

What is returned upon execution?

A. 0 rows
B. 2 rows
C. 1 row
D. an error

Answer: C

NEW QUESTION # 216
......

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