A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.

In the example above, if any of the "UnitsOnOrder" values are NULL, the result will be NULL.

A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.

MySQL IFNULL () Function The MySQL IFNULL() function lets you return an alternative value if an expression is NULL. The example below returns 0 if the value is NULL:

TypeScript has a powerful system to deal with null or undefined values. By default null and undefined handling is disabled, and can be enabled by setting strictNullChecks to true. The …

The SQL CASE Expression The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it …

REMOVE ADS Specify Column You can specify a column name instead of the asterix symbol (*). If you specify a column name instead of (*), NULL values will not be counted.

Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation!

The SQL ANY and ALL Operators The ANY and ALL operators allow you to perform a comparison between a single column value and a range of other values.

Null In JavaScript null is "nothing". It is supposed to be something that doesn't exist. Unfortunately, in JavaScript, the data type of null is an object. You can empty an object by …