1Z0-909 Practice Online

Question 1

Examine these commands which execute successfully in the sequence shown in Sessions S1 and S2:

Now, examine this statement that execute successfully in s1:

S1> SELECT * FROM emp;

Which is true about the result of the select statement?

A :

The inserted row is returned because the transaction is auto committed in S2.

B :

The inserted row is not returned because the isolation level is READ COMMITTED in S2.

C :

The inserted row is not returned because the transaction still active in s2.

D : The inserted row is returned because the isolation level is RPEATABLE READ in S1.

Answer: C

Question 2

You must write a statement that combines the first_name and last_name columns from the

employees table as "last_name, first_name."

Which two statements will do this?

A : SELECT last_name + ', ' + first_name FROM employees;

B : SELECT CONCAT_WS(', ',last_name,first_name) FROM employees;

C : SELECT GROUP_CONCAT(last_name, first_name) FROM employees;

D : SELECT last_name, ‘ , ',first_name FROM employees;

E : SELECT CONCAT(last name,', ',first_name) FROM employees;

Answer: A,B

Question 3

Examine this statement which has executed successfully:

A : Execution performance can be improved by using like instead of RLIKE.

B : The statement takes advantage of index description_idx.

C : Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.

D : No index will improve statement performance.

E : Execution performance can be improved by adding an index on column description.

Answer: A

Question 4

Examine the output:

Which explain command will obtain the output?

A : EXPLAIN ANALYZE

B : EXPLAIN PARTITIONS

C : EXPLAIN FORMAT=TREE

D : EXPLAIN PORMAT^TRADITIONAL

E : EXPLAIN PORMAT=JSON

Answer: A

Question 5

Examine these statement which execute successfully:

Now, examine this desired output:

Which two queries will produce the out?

A :

B :

C :

D :

E :

Answer: B,C

Name:	MySQL 8.0 Database Developer
Exam Code:	1Z0-909
Certification:	Oracle Database
Vendor:	Oracle
Total Questions:	65
Last Updated:	Apr 24, 2024

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