MySQL GROUP BY behavior

Question

Given the following table \'foo\'

ID | First Name | Last Name
----------------------------
67   John        Smith
----------------------------
6         


        

Answer 1

In standard SQL, This SQL should fail, with a server processor error something like

"firstname, and lastname cannot be included in the select clause unless they are also in the group By, or are part of an aggregate function."

Does MySql actually return data for this ?