I have a field which is a varchar(20)

When this query is executed, it is fast (Uses index seek):

```
SELECT * FROM [dbo].[phone] WHERE phone = '5554474477'

```

But this one is slow (uses index scan).

```
SELECT * FROM [dbo].[phone] WHERE phone = N'5554474477'

```

I am guessing that if I change the field to an nvarchar, then it would use the Index Seek.