Foxpro VS SQL Logic - tsql

Question

I couldn't think of a better title. If you have any suggestions, feel free to edit the title of my post.
I have a foxpro query that looks like this:
Sele
a.plan_enddt as enddt, a.plrevno, a.keyfld, "PLAN " as source ;
from a_plan a inner join c_temp1a_pre b ;
on a.keyfld=b.keyfld and a.plrevno=b.plrevno ;
into cursor c_temp1a ;
group by a.keyfld ;
where a.plan_enddt>=date1 ;
What I am trying to do is translate from foxpro into T-SQL.
Wouldn't this foxpro statement fail because only 1 column is listed in the group by?
Edit:
I am not looking for a solution to fixing my foxpro statement
In TSQL, you can't just group by 1 column if you have multiple in the select statement, even if you aren't using an aggregate function.
Is this also true in Foxpro?

Answer 1

You could use:
Select MIN(a.plan_enddt) as enddt, MIN(a.plrevno), a.keyfld, 'PLAN ' as [source]
from a_plan a
inner join c_temp1a_pre b
on a.keyfld=b.keyfld
and a.plrevno=b.plrevno
where a.plan_enddt>=date1
group by a.keyfld ;
"I am not looking for a solution to fixing my foxpro statement"
This is the same case as between MySQL and PostgreSQL: Group by clause in mySQL and postgreSQL, why the error in postgreSQL?
SQL99 and later permits such nonaggregates per optional feature T301 if they are functionally dependent on GROUP BY columns
T-SQL 2.1.2.221 T301, Functional dependencies

Answer 2

It looks as bug in Foxpro (Visual Foxpro 8 and earlier) to accept such invalid group by clause. All fields listed in select that are not aggregate values should be also part of group by fields.
Like this:
select
min(a.plan_enddt) as enddt, min(a.plrevno) as plrevno, a.keyfld, "PLAN " as source
from a_plan a inner join c_temp1a_pre b
on a.keyfld=b.keyfld and a.plrevno=b.plrevno
into cursor c_temp1a
group by a.keyfld
where a.plan_enddt>=date1 ;
or this:
select
a.plan_enddt as enddt, a.plrevno, a.keyfld, "PLAN " as source
from a_plan a inner join c_temp1a_pre b
on a.keyfld=b.keyfld and a.plrevno=b.plrevno
into cursor c_temp1a
group by a.keyfld, a.plan_enddt, a.plrevno
where a.plan_enddt>=date1 ;
But in this case you can get more than one record, there is group by few fields.