Given below is a list of functions and their purpose in random order.
Function Purpose
1)NVL a) Used for evaluating NOT NULL and NULL values
2)NULLIF b) Used to return the first non- null values in a list of expressions
3)COALESCE c) Used to compare two expressions. If both are same, it returns NULL; otherwise, it returns only the first expression.
4)NVL2 d) Used to convert NULL values to actual values Identify the correct combination of functions and their usage.
A.
1-a, 2-c, 3-b, 4-d
B.
1-d, 2-c, 3-b, 4-a
C.
1-b, 2-c, 3-d, 4-a
D.
1-d, 2-b, 3-c, 4-a
d
B
B