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Oracle MySQL 8.0 Database Developer Sample Questions (Q42-Q47):

NEW QUESTION # 42
Examine these statements which execute successfully:

Which two changes will improve this query performance?

A. CREATE INDEX IX1 ON locations (loc_shareci) ;
B. CREATE INDEX 1X6 ON users (user_name);
C. CREATE INDEX 1X7 ON users (user_name) USING HASH;
D. CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH
E. CREATE INDEX 1X4 ON Locations (site_id, loc_shared);
F. CREATE INDEX 1X5 ON users (loc_id);
G. CREATE INDEX 1X3 ON locations <loc_site_id) ;

Answer: B,C

NEW QUESTION # 43
Which two differences exist between the timestamp and date time data types?

A. timestamp converts the value based on the session time zone.
B. timestamp uses less storage space.
C. timestamp stores the interval between two dates.
D. timestamp has larger range of values.
E. timestamp stores more decimal points in seconds

Answer: A,B

NEW QUESTION # 44
The employee table includes these columns:
e_id INT, e_name VARCHAR (45), dept_id INT salart INT
You must create a stored function, getMaxSalary(), which returns the maximum salary paid for a given department id.
Which statement will create the function?

Answer: B

NEW QUESTION # 45
Which two are true about MySQL Document Store?

A. It allows one to bypass the SQL layer of the server.
B. It can store documents greater than 4 GB.
C. It helps to store data items in a schema-less key-value store.
D. There is no access to relational tables.
E. It depends heavily on strictly typed data.

Answer: A,C

NEW QUESTION # 46
Examine these statements:
SET collation_connection=utf8mb4_0900_as_cs;
SELECT STRCMPCAlice', UCASE ('Alice* )) ;
What is displayed?

A. 0
B. NULL
C. ERROR: 1267 (HYOOO): Illegal mix of collations
D. 1
E. 2

Answer: A

NEW QUESTION # 47
......

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