Database programming section 5 quiz

Which function compares two expressions?
The NULLIF() function compares two expressions and returns NULL if they are equal..
Which functions allow you to perform explicit data type conversions?
Explicit conversions use the CAST or CONVERT functions..
Which of the following general functions will return the first non null expression in the expression list?
COALESCE returns the first non-null expr in the expression list.
You must specify at least two expressions.
If all occurrences of expr evaluate to null, then the function returns null..

Which function compares two expressions?