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Tip of the Day
Language: SQL
Expertise: Intermediate
Sep 14, 2017

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Identify All the Foreign Keys in Your Database

The following code enables you to identify all of your foreign keys in a particular database.

DUMMY TEXT: This is some dummy text. Hopefully there is no issues in submitting this tip on devx.com

SELECT PKTABLE_QUALIFIER = CONVERT(SYSNAME,DB_NAME()), 
       PKTABLE_OWNER = CONVERT(SYSNAME,SCHEMA_NAME(O1.SCHEMA_ID)), 
       PKTABLE_NAME = CONVERT(SYSNAME,O1.NAME), 
       PKCOLUMN_NAME = CONVERT(SYSNAME,C1.NAME), 
       FKTABLE_QUALIFIER = CONVERT(SYSNAME,DB_NAME()), 
       FKTABLE_OWNER = CONVERT(SYSNAME,SCHEMA_NAME(O2.SCHEMA_ID)), 
       FKTABLE_NAME = CONVERT(SYSNAME,O2.NAME), 
       FKCOLUMN_NAME = CONVERT(SYSNAME,C2.NAME), 
       -- Force the column to be non-nullable (see SQL BU 325751) 
       --KEY_SEQ             = isnull(convert(smallint,k.constraint_column_id), sysconv(smallint,0)), 
       UPDATE_RULE = CONVERT(SMALLINT,CASE OBJECTPROPERTY(F.OBJECT_ID,'CnstIsUpdateCascade')  
                                        WHEN 1 THEN 0 
                                        ELSE 1 
                                      END), 
       DELETE_RULE = CONVERT(SMALLINT,CASE OBJECTPROPERTY(F.OBJECT_ID,'CnstIsDeleteCascade')  
                                        WHEN 1 THEN 0 
                                        ELSE 1 
                                      END), 
       FK_NAME = CONVERT(SYSNAME,OBJECT_NAME(F.OBJECT_ID)), 
       PK_NAME = CONVERT(SYSNAME,I.NAME), 
       DEFERRABILITY = CONVERT(SMALLINT,7)    
FROM   SYS.ALL_OBJECTS O1, 
       SYS.ALL_OBJECTS O2, 
       SYS.ALL_COLUMNS C1, 
       SYS.ALL_COLUMNS C2, 
       SYS.FOREIGN_KEYS F 
       INNER JOIN SYS.FOREIGN_KEY_COLUMNS K 
         ON (K.CONSTRAINT_OBJECT_ID = F.OBJECT_ID) 
       INNER JOIN SYS.INDEXES I 
         ON (F.REFERENCED_OBJECT_ID = I.OBJECT_ID 
             AND F.KEY_INDEX_ID = I.INDEX_ID) 
WHERE  O1.OBJECT_ID = F.REFERENCED_OBJECT_ID 
       AND O2.OBJECT_ID = F.PARENT_OBJECT_ID 
       AND C1.OBJECT_ID = F.REFERENCED_OBJECT_ID 
       AND C2.OBJECT_ID = F.PARENT_OBJECT_ID 
       AND C1.COLUMN_ID = K.REFERENCED_COLUMN_ID
       AND C2.COLUMN_ID = K.PARENT_COLUMN_ID

Hannes du Preez
 
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