Foreign key oracle

Foreign key on table oracle

SELECT c.OWNER, a.TABLE_NAME, a.COLUMN_NAME, a.CONSTRAINT_NAME, 
       c.R_OWNER AS REF_OWNER, cpk.TABLE_NAME AS REF_TABLE, 
       cpk.CONSTRAINT_NAME AS REF_PK
FROM ALL_CONS_COLUMNS a 
JOIN ALL_CONSTRAINTS c ON a.OWNER = c.OWNER
    AND a.CONSTRAINT_NAME = c.CONSTRAINT_NAME
 JOIN ALL_CONSTRAINTS cpk ON c.R_OWNER = cpk.OWNER
    AND c.R_CONSTRAINT_NAME = cpk.CONSTRAINT_NAME
WHERE c.CONSTRAINT_TYPE = 'R' AND c.TABLE_NAME= 'table_name';

Oracle foreign key reference table

SELECT cons.OWNER 			AS CHILD_OWNER,
       cons.TABLE_NAME 		AS CHILD_TABLE,
       cons.CONSTRAINT_NAME AS CONSTAINT_NAME,
       cons.CONSTRAINT_TYPE AS CONSTRAINT_TYPE,
       col.OWNER 			AS PARENT_OWNER,
       col.TABLE_NAME 		AS PARENT_TABLE,
       col.COLUMN_NAME 		AS COLUMN_NAME
FROM DBA_CONS_COLUMNS col, DBA_CONSTRAINTS cons
WHERE cons.R_OWNER = col.OWNER
  AND cons.R_CONSTRAINT_NAME = col.CONSTRAINT_NAME
  AND cons.TABLE_NAME = 'table_name';

Source: dba-oracle.com

Foreign key oracle

ALTER TABLE table_name
ADD CONSTRAINT constraint_name
   FOREIGN KEY (column1, column2, ... column_n)
   REFERENCES parent_table (column1, column2, ... column_n);

Example

ALTER TABLE products
ADD CONSTRAINT fk_supplier
  FOREIGN KEY (supplier_id)
  REFERENCES supplier(supplier_id);

Similar codes

3 votes345 views2 answers
Oracle privileges users
SQL
1 vote357 views1 answer
Code: "ER_TRUNCATED_WRONG_VALUE", errno: 1292, sqlMessage: "Incorrect date value: '2021-03-20T18:30:00.000Z' for column 'mgfdate' at row 1", sqlState: "22007", index: 0, …}
SQL
0 vote372 views1 answer
How to run mysql on terminal mac
SQL
1 vote324 views2 answers
End mysql command
SQL
6 votes324 views1 answer
To count number of rows in SQL table
SQL
0 vote329 views1 answer
Find largest table in mysql database
SQL
0 vote366 views1 answer
Oracle sql how to overcome 999 limit for IN
SQL
0 vote326 views3 answers
Mysqli count down
SQL
1 vote555 views3 answers
Sql subquery
SQL
0 vote350 views1 answer
Psql list rules
SQL