Data Dictionary Info for Constraints

Question

Hi,
I want to get Information from the data dictionary about foreign key constraints.
I want to get information about all constraints which REFER to a certain table and column, so I want to get the table/colum which is the parent in a foreign_key realtionship.
I can use ALL_CONS_COLUMNS, but I only get the parent table but not the child table.
Example:
Table A.COLUMN_1 is the parent, there are two foreign key relationships: table B.COLUMN_2 and table C.COLUMN_2, they refer to table A.COLUMN_1.
I want a query which gives me table B and C when I specify table A.COLUMN_1.
Thanks for your help.
Bernhard

Answer 1

-- Dictionary Queries to Determine FK Columns for Given PK
--    note: uses the Ora9i example data in SH schema...
-- Query for Forums user who wanted to query on table_name and column_name
select all pk_cons.constraint_name   pk_constraint
          ,fk_cons.constraint_name   fk_constraint
          ,fk_cons_cols.table_name   fk_table
          ,fk_cons_cols.column_name   fk_columns
from       all_cons_columns   pk_cons_cols
inner join all_constraints   pk_cons
        on pk_cons_cols.owner = pk_cons.owner and
             pk_cons_cols.constraint_name = pk_cons.constraint_name
inner join all_constraints   fk_cons
        on fk_cons.r_owner = pk_cons.owner and
             fk_cons.r_constraint_name = pk_cons.constraint_name
inner join all_cons_columns   fk_cons_cols
        on fk_cons.owner = fk_cons_cols.owner and
             fk_cons.constraint_name = fk_cons_cols.constraint_name
where      pk_cons.owner = 'SH'
and        pk_cons.table_name = 'PRODUCTS'
and        pk_cons_cols.column_name = 'PROD_ID'
-- A better query that uses only table name
select all pk_cons.constraint_name   pk_constraint
          ,fk_cons.constraint_name   fk_constraint
          ,fk_cons_cols.table_name   fk_table
          ,fk_cons_cols.column_name   fk_columns
from       all_constraints   pk_cons
inner join all_constraints   fk_cons
        on fk_cons.r_owner = pk_cons.owner and
             fk_cons.r_constraint_name = pk_cons.constraint_name
inner join all_cons_columns   fk_cons_cols
        on fk_cons.owner = fk_cons_cols.owner and
             fk_cons.constraint_name = fk_cons_cols.constraint_name
where      pk_cons.owner = 'SH'
and        pk_cons.table_name = 'PRODUCTS'
and        pk_cons.constraint_type = 'P'
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