Is Null and Ifnull
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...
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.
What is the difference between NVL and Isnull?
ISNULL replaced the Oracle NVL function in the SQL server. When an expression in SQL server is NULL, the ISNULL function allows you to return an alternative value for the null. ISNULL checks whether the value or an expression is true or false.
What is SQL Ifnull?
The IFNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.
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