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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

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