Question 1

Examine this statement which has executed successfully: 1z0-909-page46-image80

Options :

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 2

You must write a statement that combines the first_name and last_name columns from theemployees table as "last_name, first_name."Which two statements will do this?

Options :

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:DECLARE not_found CONDITION FOR SQLSTATE '02000';In which two statements can not found be used?

Options :

A : in a leave statement to exit a loop

B : in an if statement

C : in a while loop

D : in a handler declaration

E : in a signal statement

Answer: A,C

Question 4

Examine these statement which execute successfully: 1z0-909-page46-image32 Now, examine this desired output: 1z0-909-page46-image31 Which two queries will produce the out?