# ignore_if_exists()

This function ensures that vertex attributes retain their values if they have an existing value.

Any type.

## Return value

• If there already exists a value for the attribute, return the existing value. This makes sure that the existing value is retained.

• If there isn’t an existing attribute value, return the input token.

## Example

If we have the following data in a CSV file of the different scores of test takers, and Tommy and Amy both already have existing scores. We want to load new scores only if the vertex doesn’t have an existing score:

name score

Tommy

95

Tommy

93

Amy

94

Amy

99

Emily

97

Emily

92

We can write the following `LOAD` statement:

``````LOAD f TO VERTEX Person
VALUES ($"name", REDUCE(ignore_if_exists($"score"))``````