>
>select * from MyTable group by Field1, Field2
>
This can produce unpredictable results for the fields not included in the GROUP BY clause (for practical purposes: the data will be chosen from an arbitrary record within each group).
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)