My question is about performance on SQL server tables.

Assume I have a table that has many columns, for example 30 columns, with 1 column indexed. This table has approximately 30,000 rows.

If I perform a select that selects the indexed column, and one more, for example this:

```
SELECT IndexedColumn, column1
FROM table

```

Will this be slower than performing the same select on a table that only has 2 columns, and doing a `SELECT * ...`

So basically, will the existence of the extra columns slow down the select query event if I am not retrieving the data from the extra columns?