Query to find columns (in relation FK) which gives bad child result...
I need to find all the columns in a Parent child table. I wrote the below query to do this.CREATE TABLE test_parent
( supplier_id number(10) not null,
supplier_name varchar2(50) not null,
contact_name varchar2(50),
CONSTRAINT supplier_pk PRIMARY KEY (supplier_id)
);
CREATE TABLE test_child
( product_id number(10) not null,
child_supplier_id number(10) not null, ---*its child_supplier_id not supplier_id*
CONSTRAINT fk_supplier
FOREIGN KEY (child_supplier_id)
REFERENCES test_parent(supplier_id)
ON DELETE CASCADE
);
insert into test_parent values (3,'ABC','John');
insert into test_child values (993983,3);
COL TABLE_NAME FORMAT A25
COL CONSTRAINT_TYPE FORMAT A25
COL CHILD_COLUMN FORMAT A25
select a.table_name,
b.column_name child_column
from user_constraints a,
user_cons_columns b
where a.r_constraint_name=b.constraint_name
and R_CONSTRAINT_NAME = (select constraint_name from
user_constraints where table_name = 'TEST_PARENT' -- I enter the parent table name here
and constraint_type = 'P'
)
and constraint_type = 'R';
TABLE_NAME CHILD_COLUMN
------------------------- ------------------------
TEST_CHILD SUPPLIER_ID
It should be*child_supplier_id*
Let's not my request. I'm doing something really stupid here.
Try this one
select fk_cons.table_name, fk_cons.constraint_name, fk_cols.column_name
from user_constraints PK_cons
join user_constraints fk_cons on fk_cons.r_constraint_name = pk_cons.constraint_name
join user_cons_columns fk_cols on fk_cols.constraint_name = fk_cons.constraint_name
where fk_cons.constraint_type = 'R'
and PK_cons.table_name = 'TEST_PARENT';
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