Question

I have a single table with this schema:

 |code|time|fk|
 --------------
 |a   |0.1 |2 |
 |b   |0.2 |1 |
 |b   |0.3 |2 |

And I would want to make compare all the codes and give me something like this:

 |code|time_fk1|time_fk2|
 ------------------------
 |a   |null    |0.1     |
 |b   |0.2     |0.3     |

sql: select code, time_fk1, time_fk2 from table2 as fk1 left join table2 as fk2 on fk1.code=fk2.code where (fk1.fk=1 or fk1.fk is null) and (fk2.fk=2 or fk2.fk is null)

The goal is a full outer join: but im not complicating to much yet because not even a left/right join works

But access gives me only this with that query:

 |code|time_fk1|time_fk2|
 ------------------------
 |b   |0.2     |0.3     |

It acts exactly as it were a inner join! If I change the “left” in the above query for (right or inner the results are the same)

thanks

Answer 1

select code, SUM(time_fk1), SUM(time_fk2)
from

(   
(select code, time as time_fk1, 0
from table 
where fk=1)

UNION

(select code, 0,time as time_fk2
from table 
where fk=2)
) a

group by code

However, using this query b will come twice in the result if it has time against both fk’s.