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Oracle MySQL 8.0 Database Developer Sample Questions (Q63-Q68):

NEW QUESTION # 63
The variables c and d are declared as integer types.
Examine these initialization statements with placeholder value <p1>, which execute successfully:
Now, examine this loop which executes successfully:

Which loop results in the same value of d for all valid values of <p1>?
A)

B)

C)

A. Option DB. Option BC. Option AD. Option C

Answer: C

NEW QUESTION # 64
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. No index will improve statement performance.D. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.E. Execution performance can be improved by adding an index on column description.

Answer: A

NEW QUESTION # 65
Examine this statement which executes successfully:

The table is populated with a range of values including jobs for Robert, John, and Katie. Now, examine this statement and output:

Why is an empty result set returned?

A. The JSON datatype cannot be used in virtual columns.B. The select requires json_unquoteo in the where clause.C. The json_extract() function requires a length value that matches the field length in the schema.D. The virtual values in the name column must be accessed using functions.E. Table statistics must be updated to generate values for the name column.

Answer: A

NEW QUESTION # 66
Examine the contents of these tables:

Now examine the expected results for a user with privileges to access the table:

Which query returns the expected results?
A)

B)

C)

D)

A. Option DB. Option BC. Option AD. Option C

Answer: C

NEW QUESTION # 67
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 GROUP_CONCAT(last_name, first_name) FROM employees;B. SELECT CONCAT(last name,', ',first_name) FROM employees;C. SELECT last_name + ', ' + first_name FROM employees;D. SELECT last_name, ' , ',first_name FROM employees;E. SELECT CONCAT_WS(', ',last_name,first_name) FROM employees;

Answer: A,C

NEW QUESTION # 68
......

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