What Does Ifnull Mean in Sql?

The IFNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.

How does Ifnull work in MySQL?

IFNULL() function

MySQL IFNULL() takes two expressions and if the first expression is not NULL, it returns the first expression. Otherwise, it returns the second expression. Depending on the context in which it is used, it returns either numeric or string value.

What is the difference between Isnull and Ifnull in SQL?

IFNULL is equivalent to ISNULL. IFNULL is equivalent to COALESCE except that IFNULL is called with only two arguments. ISNULL(a,b) is different from x IS NULL . The arguments can have any data type supported by Vertica.