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1Z0-909 Valid Braindumps Ebook & 1Z0-909 Reliable Test Objectives

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Oracle 1Z0-909 Exam, also known as the MySQL 8.0 Database Developer exam, is designed to test candidates' knowledge and skills in developing applications using MySQL 8.0. 1Z0-909 exam is intended for individuals who want to demonstrate their expertise in developing and maintaining MySQL databases, as well as those who want to enhance their career prospects in the field of database development.

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Oracle MySQL 8.0 Database Developer Sample Questions (Q12-Q17):

NEW QUESTION # 12
Examine this statement which has executed successfully:

A. Execution performance can be improved by using like instead of RLIKE.
B. No index will improve statement performance.
C. Execution performance can be improved by adding an index on column description.
D. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.
E. The statement takes advantage of index description_idx.

Answer: D

NEW QUESTION # 13
The employee table includes these columns:
e_id INT, e_name VARCHAR (45), dept_id INT salart INT
You must create a stored function, getMaxSalary(), which returns the maximum salary paid for a given department id.
Which statement will create the function?
A)

A. Option D
B. Option A
C. Option C
D. Option B

Answer: B

NEW QUESTION # 14
Which two statements are true about aggregate functions?

A. MAX () returns null if there are no rows to aggregate.
B. COUNT (distinct) returns a count of the number of rows with different values including Null.
C. SUM () returns o if there are no rows to aggregate.
D. AVG () does not allow use of the distinct option.
E. MIN () cannot use distinct when it executes as a Windows function.

Answer: D

NEW QUESTION # 15
What is an advantage of using mysqli in PHP programs rather than using PHP Data Objects (PDO)?

A. mysqli supports non blocking, asynchronous queries.
B. mysqli includes X DevAPI functions.
C. mysqli can access databases from other vendors.
D. mysqli supports object oriented programming.

Answer: D

NEW QUESTION # 16
Which select statement returns true?

A. SELECT NULL <=> NULL;
B. SELECT NULL := NULL;
C. SELECT NULL = NULL;
D. SELECT NULL <> NULL;

Answer: A

NEW QUESTION # 17
......

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