Pass Guaranteed Quiz 1z0-071 - Oracle Database SQL High Hit-Rate Real Exam Questions

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Oracle Database SQL Sample Questions (Q223-Q228):

NEW QUESTION # 223
You want to write a query that prompts for two column names and the WHEREcondition 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?

Answer: C

NEW QUESTION # 224
Which two statements are true about views?

A. Tables in the defining query of a view must always exist in order to create the view.
B. Views can be indexed.
C. The with check clause prevents certain rows from being displayed when querying the view.
D. Views can be updated without the need to re-grant privileges on the view.
E. The with check clause prevents certain rows from being updated or inserted in the underlying table through the view.

Answer: D,E

NEW QUESTION # 225
Examine the description of the EMPLOYEEStable:

Which query is valid?

A. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id,
join_date;
B. SELECT dept_id, join_date, SUM(salary) FROM employees GROUP BY dept_id;
C. SELECT dept_id, AVG(MAX(salary)) FROM employees GROUP BY dept_id;
D. SELECT dept_id, MAX(AVG(salary)) FROM employees GROUP BY dept_id;

Answer: B

NEW QUESTION # 226
Examine the description of EMPLOYEES table:
Which three queries return all rows for which SALARY+COMMISSION is greate than 20000?

A. SELECT * FROM employees WHERE salary+NVL(commission,0)>=20000;
B. SELECT * FROM employees WHERE salary+NVL2(commission,commission,0)>=20000;
C. SELECT * FROM employees WHERE NVL(salary+commission,0)>=20000;
D. SELECT * FROM employees WHERE NVL(salary+commission,0)>==20000;
E. SELECT * FROM employees WHERE NVL2(salary)+commission,salary+commission,
F. SELECT * FROM employees WHERE salary+NULLF(commission,0)>=20000;

Answer: A,B,F

Explanation:
In Oracle Database 12c, when dealing with NULL values in arithmetic expressions, the functions NVL, NVL2, and equivalent techniques using NULLIF or arithmetic operations with NULL can be crucial.
Option A: SELECT * FROM employees WHERE salary + NULLIF(commission, 0) >= 20000; NULLIF(value1, value2) returns NULL if value1 is equal to value2, otherwise it returns value1. In this case, if commission is NULL, it treats it as 0.
This query correctly adds salary and commission (assuming 0 when commission is NULL) and checks if the total is at least 20000.
Option B: SELECT * FROM employees WHERE salary + NVL2(commission, commission, 0) >= 20000; NVL2(expr1, expr2, expr3) returns expr2 if expr1 is not NULL; otherwise, it returns expr3. Here, if commission is not NULL, it uses commission, otherwise 0.
This condition correctly calculates salary + commission (assuming commission as 0 if it is NULL) and checks if the total is at least 20000.
Option D: SELECT * FROM employees WHERE salary + NVL(commission, 0) >= 20000; NVL(expr1, expr2) returns expr2 if expr1 is NULL; otherwise, it returns expr1. This query treats commission as 0 if it is NULL.
It correctly sums salary and commission and compares the result against 20000.
Options C, E, and F contain either syntax errors or logical errors in handling NULLs and comparisons.

NEW QUESTION # 227
Which three statements are true about a self join?

A. It must be an inner join.
B. The query must use two different aliases for the table.
C. It can be an outer join.
D. The on clause must be used.
E. It must be an equijoin.
F. The on clause can be used.

Answer: B,C,F

NEW QUESTION # 228
......

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PASS GUARANTEED QUIZ 1Z0-071 - ORACLE DATABASE SQL HIGH HIT-RATE REAL EXAM QUESTIONS

Pass Guaranteed Quiz 1z0-071 - Oracle Database SQL High Hit-Rate Real Exam Questions