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Find all Primary and Foreign Keys In A Database

Posted By:Syed Shakeer Hussain       Posted Date: June 30, 2010    Points: 10    Category: SQL Query    URL: http://www.dotnetspark.com  

To find all your foreign and primary keys in your database run the code below. The output will return the primary key, primary key table, foreign key, foreign key table. Primary keys that don't have foreign keys will have N/A in the foreign key output
 

SELECT t.table_schema AS PrimarySchemaName ,
t.TABLE_NAME AS PrimaryKeyTable,
tc.CONSTRAINT_NAME AS PrimaryKey,
COALESCE(tc2.constraint_schema,'N/A') AS ForeignSchemaName,
COALESCE(rc1.CONSTRAINT_NAME,'N/A') AS ForeignKey ,
COALESCE(tc2.TABLE_NAME,'N/A') AS ForeignKeyTable
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
INNER JOIN INFORMATION_SCHEMA.TABLES t ON tc.TABLE_NAME = t.TABLE_NAME
LEFT JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1 ON tc.CONSTRAINT_NAME =rc1.UNIQUE_CONSTRAINT_NAME
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc2 ON tc2.CONSTRAINT_NAME =rc1.CONSTRAINT_NAME
WHERE TC.CONSTRAINT_TYPE ='PRIMARY KEY'
ORDER BY tc.TABLE_NAME,tc.CONSTRAINT_NAME,rc1.CONSTRAINT_NAME


     

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