Free Oracle 1Z0-909 Practice Test & Real Exam Questions

Exam Code/Number: 1Z0-909
Exam Name/Title: MySQL 8.0 Database Developer
Certification Provider: Oracle
Corresponding Certification: MySQL Developer

Exam Questions: 66
Updated On: Oct 06, 2026

Question #22

Examine this statement and output:

Now, examine these desired output values:

Which statement updates the table data as require

A. UPDATE examresult SET score=ROUND(CEIL(score

B. UPDATE exam_result SET score=TRUNCATE(score,1);

C. UPDATE exam_result SET score=CEIL(TRUNCATE(sco

D. UPDATE exam_result SET score=TRUNCATE

E. UPDATE exam_result SET score=ROUND(score,1);

F. UPDATE exam_result SET score=CEIL(ROUND(score,1));

Discussion 0

Correct Answer: E Vote an answer

Question #23

Examine this table definition:

The table must always remain a valid document store collection. What restriction does this impose on any added column?

A. The column must be used in a unique constraint.

B. The column must be a generated column referencing only an existing attribute of doc.

C. The column must be indexed.

D. The column must be a generated column referencing any attribute of doc.

E. The column must have a default value.

Discussion 0

Correct Answer: D Vote an answer

Question #24

Examine these MySQL Shell statements:

What is the true about the attempts to add document to the collection?

A. First two documents are added, then mismatched field names cause an error.

B. First two documents are added, then mismatched field names cause a warning.

C. All documents are added without any error or warning.

D. First three documents are added, then different number of fields cause an error.

E. All documents are added and cause a warning.

Discussion 0

Correct Answer: E Vote an answer

Question #25

Which select statement returns true?

A. SELECT NULL = NULL;

B. SELECT NULL := NULL;

C. SELECT NULL <=> NULL;

D. SELECT NULL <> NULL;

Discussion 0

Correct Answer: C Vote an answer

Question #26

Examine this SQL statement:

A. db . country. fields ( [ ' Name ' , 'Population']) . select (' limit=5 ' ) .where('Name LIKE "United%" ' )

B. db.country. fields ( [ 'Name ' , 'Population* ] ) .where ( 'Name LIKE "United%',,) -select ()-limit(5)

C. db . country. Select ([Name' , 'Population.'] ) -limit (5) .where('Name LIKE "United%"')

D. db. country-select(['Name','Population']) .where('Name LIKE :param') -bind ('param' , 'United*') -limit(5)

E. db . country, select ( [ ' Name LIKE "united%" ' , ' Population>^0 ' ] ) - limit (5)

Discussion 0

Correct Answer: D Vote an answer

Question #27

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 isolation level is RPEATABLE READ in S1.

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

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

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

Discussion 0

Correct Answer: D Vote an answer

Question #28

Examine these statements which execute successfully:

Which two changes will improve this query performance?

A. CREATE INDEX 1X6 ON users (user_name);

B. CREATE INDEX 1X4 ON Locations (site_id, loc_shared);

C. CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH

D. CREATE INDEX 1X3 ON locations <loc_site_id) ;

E. CREATE INDEX 1X7 ON users (user_name) USING HASH;

F. CREATE INDEX IX1 ON locations (loc_shareci) ;

G. CREATE INDEX 1X5 ON users (loc_id);

Discussion 0

Correct Answer: A,E Vote an answer

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