What are some common techniques for handling NULL values in MySQL queries within PHP applications?

Handling NULL values in MySQL queries within PHP applications can be done using techniques such as using the IS NULL or IS NOT NULL operators in WHERE clauses, using IFNULL() function to replace NULL values with a specified default value, or using COALESCE() function to return the first non-NULL value from a list of expressions. 

// Example using IS NULL operator
$query = "SELECT * FROM table WHERE column IS NULL";

// Example using IFNULL() function
$query = "SELECT IFNULL(column, 'default_value') FROM table";

// Example using COALESCE() function
$query = "SELECT COALESCE(column1, column2, 'default_value') FROM table";

Keywords

MySQL PHP NULL values IS NULL COALESCE

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