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How to check constraints on a table in sql oracle

How to find constraints on a table in oracle

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

How to check constraints on a table in sql oracle

SELECT *
  FROM user_cons_columns
 WHERE table_name = '<your table name>';

Source: stackoverflow.com

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