left joining the same table = duplicates 1

[piti]

i have a query similar to this
select table1.col, t2_1.name as name1, t2_2.col_name as name2
from
table1
left join table2 t2_1 on table1.id = t2_1.id
left join table2 t2_2 on table1.id = t2_2.id and t2_2.id2 <> t2_1.id2

to retrieve data from table2 based on data in table1, there must not be related data in table2, but there can be max 2 records in table2 related to table1, but if there are 2 records i receive a result set with 2 rows with the same information, just the values selected from table2 are switched
e.g.
col | name1 | name2
1 test test2
1 test2 test

i want to prevent this kind of duplicates, any idea how?

 

[JohnDTampaBay]

select table1.col
, t2_1.name as name1
, t2_2.col_name as name2
from
table1
left join table2 t2_1 on table1.id = t2_1.id
left join table2 t2_2 on table1.id = t2_2.id
and t2_2.id2 > t2_1.id2



--John
-----------------------------------
Behold! As a wild ass in the desert
go forth I to do my work.
--Gurnie Hallock (Dune)

 

[piti]

well, yeah i thought about this kind of condition too
but for whatever reason, using this condition the complete query (about 15 joined tables ;-)) returns still 2 rows for the described scenario, but the second one has NULLs as values for the second copy of "table2"