Sometime doesn't

Good Morning Everyone,
parent, child
master, detail
Primary, Foreign
Attribute, column
Entity, Table, relation
Tuple, row, record
Create, delete, alter, truncate,
tables with Join - outer, inter, cross,
Cartesian product
nested queries
select, From, Where, And
Sometime works but sometime doesn't.
Can I get a informative book, links, any?
Thanks,
NY

Hi Boneist,
I think you need to feed us with tables (create table ...; insert into ...) else nobody can help you because we do not know what your table structure is.
If you want to learn how to write hierarchical queries, then have a look at the SQL references (links posted earlier), it pretty good explained in the Oracle docs.
For specific cases somebody will help here if there is enough detailed information.
best regards,
David.

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Sometime doesn't

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