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Oracle MySQL 8.0 Database Developer Sample Questions (Q56-Q61):

NEW QUESTION # 56
Which select statement returns true?

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

Answer: B

NEW QUESTION # 57
Examine the content of the employee table:

Now examine this PHP script:

Finally examine this desired output:

A. $options = [PDO:: ATTR_DEFAOLT_FETCH__MODE => PDO : : FETCH_BOTH] ;
B. $options = [PDO:: ATTR_DEFAUXT_FETCH__MODE => PDO: : PDO: :FETCH_OBJ] ;
C. $options = [PDO:: ATTR__DEFAULT_FETCH MODE => PDO: :FETCH_CLASS] ;
D. $options = [PDO:: ATTR_DEFAULT_FETCH__MODE => PDO: : FETCH_ASSOC] ;

Answer: A

NEW QUESTION # 58
Examine this statement which executes successfully:
CREATE TABLE 'fshop' ('product' JSON DEFAULT NULL ) ENGINE=InnoDB;
Now, examine a json value contained in the table:
{"name" : "orange", "varieties" : [{"VarietyName":"Clementine", "Origin" : ["PA", "BU"] }, {"VarietyName": "tangerine", "Origin" : ["CH","JP"]>]> Which will cause documents to be indexed over the 'name' key?

A. ALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product->' S - name' ) VIRTUAL, ADD KEY idx_name (name) ;
B. ALTER TABLE fshop ADD COLUMN name VARCHAR(20), ADD KEY idx_name (name) ;
C. ALTER TABLE fshop ADD COLUMN name VARCHAR(100) AS (product->' S - varieties' ) VIRTUAL, ADD KEY idx_name (name) ;
D. ALTER TABLE fshop ADD name VARCHAR(20) AS (JSON_ONQUOTE (product->"S.varieties.VarietyName")), ADD INDEX (name);
E. ALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product-
>* S .varieties. VarietyName ' ) VIRTUAL, ADD KEY idx_name (name.) ;

Answer: C

NEW QUESTION # 59
Examine this statement and output:
CREATE TABLE geom (g GEOMETRY NOT NOLL, SPATIAL INDEX(g) ) ; Query OK, 0 rows affected, 1 warning (0.01 sec) An attempt is made to add an SRID attribute to the column using the statement:
ALTER TABLE geom MODIFY COLUMN g geometry NOT NULL SRID 0;
Which is true?

A. Execution succeeds and allows the use of the index by the optimizer.
B. Execution succeeds with a warning.
C. An error is generated because the index prevents changes to the column.
D. An error is generated because srid o is an invalid identifier value.

Answer: C

NEW QUESTION # 60
Examine the structure of the emp table:

Examine the structure of the emp_vu1 view based on the emp table:

Now, examine this statement:
mysq1> INSERT INTO emp_vul VALUES ('Alice',20000) ;
What is true about executing the statement?

A. It returns an error because the PRIMARY ACCOUNT column is not selected for the view definition.
B. It returns an error because an insert operation is not allowed on views.
C. It inserts a row in the emp table.
D. It inserts a row in the view only.

Answer: C

NEW QUESTION # 61
......

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