# isNotNull


`isNotNull` evaluates an expression to see if it is not null. If the expression is not null, `isNotNull` returns true, and otherwise it returns false.

## Syntax


```
isNotNull(expression)
```

## Arguments


 *expression*   
The expression to be evaluated as null or not. It can be a field name like **address1** or a call to another function that outputs a string. 

## Return type


Boolean

## Example


The following example evaluates the sales\$1amount field for null values.

```
isNotNull(salesAmount)
```

The following are the given field values.

```
20.13
(null)
57.54
```

For these field values, the following values are returned.

```
true
false
true
```