# Save Operator

Use the `save` operator to insert or update rows in a lookup table.

- If a result row has a primary key that matches an existing row, the row is updated.
- If the primary key does not exist, a new row is added.

This operation combines both **merge** and **append** updates.

## Syntax

```
<query> | save <lookup-table-name>
```

## Example

Save user details from login application logs to the `userinfo` lookup table:

```
source="login_application" | save userinfo
```

## Related content

- [FuseQL Overview](https://docs.kloudfuse.com/platform/3.5.0/fuseql/)
- [Cat Operator](https://docs.kloudfuse.com/platform/3.5.0/fuseql-cat-operators/)