I have a table data with have 100.000 rows+ and its content like below;

```
Service    Owner
ABC        JOHN
ABC        MARK
ABC        MARK
ABC        STEVE
ABC        STEVE

```

The output what i want is like below. Only getting unique values for services;

```
Service     Owner
ABC         JOHN
ABC         MARK
ABC         STEVE

```

How can i select the query?