Query to find table relationship types
Using Oracle, is there any way I can execute a query to d开发者_运维问答etermine what relationship a specific table has with any other tables in my database? I'm fiddling with the all_constraints
table as of now.
Yes, you can do this for example:
select p.table_name, 'is parent of ' rel, c.table_name
from user_constraints p
join user_constraints c on c.r_constraint_name = p.constraint_name
and c.r_owner = p.owner
where p.table_name = 'MYTABLE'
union all
select c.table_name, 'is child of ' rel, p.table_name
from user_constraints p
join user_constraints c on c.r_constraint_name = p.constraint_name
and c.r_owner = p.owner
where c.table_name = 'MYTABLE'
I think your best bet is trying to extract as much information as you can from the foreign key constraints.
Have a look at this article at Database Journal that explains foreign key data mining in detail.
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