access to an id in a subselect

Hello

I have the select...

Select x.obj_id

,(Select b.class_id)

from (select a.*

ROWNUM rnum

of (c.obj_class_id select class_id)

of obj_class2 c

where c.obj_classif_id = 5013

and c.obj_id = x.obj_id - 2438087

order of c.obj_class_id

) a

where ROWNUM < = 2

) b

where b.rnum > 1

) value_line_2

of (o.id select obj_id)

to obj o

where o.id in (3208355,3509750,3223514,3452134,3168690)

) x

As you can see, I get an ID called x.obj_id which I want to use in a subselect. The subselect statement returns multiple values, and I want to extract the value 2. But if I try to say c.obj_id = x.obj_id, said oracle x.obj_id is an invalid identifier.

If have tried a lot of things, but in the end I still get the same error. Any suggestions are welcome... of explanations too.

Thanks in advance for your efforts.

Konrad

Hi chris227 and Chris Hunt

Thank you very much for your explanations and suggestions, see the following select statement for a good solution.

As I saw on your answer of my explanations when a little lacking. So, my main selection is, think I catch an obj_id and a large number of attributes of the obj. table a subset other attributes are on other tables that I'll go with the Subselects. It's why I can't do your solutions with the join. But, as you can see it works with the row_number() (c.obj_id of partition by c.obj_class_id order).

I can name this statement of subselect with t and set the condition t.obj_id = x.obj_id which is located on the first level, so I can pick 1, 2. or 3. value, all that I need.

Thanks again for your efforts!

Best regards, Konrad

===================================

Select x.obj_id

x.whatever

.

.

-Subselect for exactly numbered attribute fetch another table, which returns many rows (attributes!). The id on that other table is identical to the id of the main table.

,(Select t.class_id)

of (c.obj_class_id select class_id)

c.obj_id

row_number() over (partition by order of c.obj_class_id c.obj_id) rn

of obj_class2 c

where c.obj_classif_id = 5013

+ 6

where t.obj_id = x.obj_id

and t.rn = 2

) wert_zeile_2

.

.

x.another_value

of (o.id select obj_id)

to obj o

where o.id in (3208355,3509750,3223514,3452134,3168690)--ce code is only for the test!

) x

Tags: Database

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