You need "GROUP BY date_entered" after WHERE clause.
select date_entered, max(pic) as topPic from litters
where date_entered = '7/19/2013'
group by date_entered
You need "GROUP BY date_entered" after WHERE clause.
select date_entered, max(pic) as topPic from litters
where date_entered = '7/19/2013'
group by date_entered