oracle - How to find the root table for child table? -


how find root table child tables ?

for example : -

 have 26 tables a,b,c ...z. need find indirect relation particular table   b has relation   c has relation b   if give table_name c, come a(indirect relation)

you can try , use hierarchical query on user_constraints

pk constraint_type = 'p'

fk constraint_type = 'r' , linked primary key r_constraint_name

something along lines might work ( not tested ) 

select  table_name     user_constraints  start      table_name = 'x'      , constraint_type = 'p'  connect r_constraint_name = prior constraint_name      , prior constraint_type = 'r'

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