SQL > SQL NULL > IFNULL Function

The IFNULL( ) function is available in MySQL, and not in SQL Server or Oracle. This function takes two arguments. If the first argument is not NULL, the function returns the first argument. Otherwise, the second argument is returned. This function is commonly used to replace NULL value with another value. It is similar to the NVL function in Oracle and the ISNULL Function in SQL Server.

For example, if we have the following table,

Table Sales_Data

Store_NameSales
Store A300
Store BNULL

The following SQL,

SELECT SUM (IFNULL(Sales,100)) FROM Sales_Data;

Result:

SUM (IFNULL(Sales,100))
400

This is because NULL has been replaced by 100 via the IFNULL function. The total then becomes 300 + 100 = 400.

Next: SQL NVL Function




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