# ConditionalOperator (legacy)
<a name="LegacyConditionalParameters.ConditionalOperator"></a>

**Note**  
We recommend that you use the new expression parameters instead of these legacy parameters whenever possible. For more information, see [Using expressions in DynamoDB](Expressions.md). 

The legacy conditional parameter `ConditionalOperator` is a logical operator used to apply to the conditions in a `Expected`, `QueryFilter` or `ScanFilter` map:
+ AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
+ OR - If at least one of the conditions evaluates to true, then the entire map evaluates to true.

If you omit `ConditionalOperator`, then `AND` is the default.

The operation will succeed only if the entire map evaluates to true.

**Note**  
This parameter does not support attributes of type List or Map.