1z0-071 Exam Dumps | Which two are true about the NVL, NVL2, and COALESCE functions?

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Question 94/144

Which two are true about the NVL, NVL2, and COALESCE functions?

A. The first expression in NVL2 is never returned.

B. NVL2 can have any number of expressions in the list.

C. COALESCE stops evaluating the list of expressions when it finds the first null value.

D. COALESCE stops evaluating the list of expressions when it finds the first non-null value.

E. NVL must have expressions of the same data type.

F. NVL can have any number of expressions in the list.

Correct Answer: D,E

A . This statement is false. In NVL2, the first expression is returned if it is not null.
B . This statement is false. NVL2 takes exactly three arguments, not any number of expressions.
C . This statement is false. COALESCE stops evaluating its list of expressions as soon as it finds the first non-null value.
D . This is true. COALESCE returns the first non-null expression in its list.
E . This statement is true. NVL requires the first and second expressions to be of the same or compatible data types because it returns the first expression if it is not null, otherwise it returns the second.
F . This statement is false. NVL takes exactly two arguments, not any number.
Reference:
Oracle Documentation on COALESCE: https://docs.oracle.com/database/121/SQLRF/functions040.htm#SQLRF00625 Oracle Documentation on NVL: https://docs.oracle.com/database/121/SQLRF/functions130.htm#SQLRF00683 Oracle Documentation on NVL2: https://docs.oracle.com/database/121/SQLRF/functions123.htm#SQLRF00682

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