Question: QUESTION 15 Commands used to create or modify database tables are called data definition language (DDL) commands . a. True b. False QUESTION 16 When

QUESTION 15 Commands used to create or modify database tables are called data definition language (DDL) commands

. a. True

b. False

QUESTION 16 When DDL operations are performed, Oracle places an ______ lock on the table so that no other user can alter the table or attempt adding to or updating the table's contents.

a. biometric

b. master

c. exclusive

d. executive

QUESTION 17 Which of the following is NOT a valid constraint type abbreviation?

a. _nn

b. _ee

c. _fk

d. _pk

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