sys.sysreferences (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
Contains mappings of the FOREIGN KEY constraint definitions to the referenced columns within the database.
Important
This SQL Server 2000 system table is included as a view for backward compatibility. We recommend that you use the current SQL Server system views instead. To find the equivalent system view or views, see Mapping System Tables to System Views (Transact-SQL). This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
| Column name | Data type | Description |
|---|---|---|
| constid | int | ID of the FOREIGN KEY constraint. |
| fkeyid | int | ID of the referencing table. |
| rkeyid | int | ID of the referenced table. |
| rkeyindid | smallint | Index ID of the unique index on the referenced table covering the referenced key-columns. |
| keycnt | smallint | Number of columns in the key. |
| forkeys | varbinary(32) | Identified for informational purposes only. Not supported. Future compatibility is not guaranteed. |
| refkeys | varbinary(32) | Identified for informational purposes only. Not supported. Future compatibility is not guaranteed. |
| fkeydbid | smallint | Reserved. |
| rkeydbid | smallint | Reserved. |
| fkey1 | smallint | Column ID of the referencing column. |
| fkey2 | smallint | Column ID of the referencing column. |
| fkey3 | smallint | Column ID of the referencing column. |
| fkey4 | smallint | Column ID of the referencing column. |
| fkey5 | smallint | Column ID of the referencing column. |
| fkey6 | smallint | Column ID of the referencing column. |
| fkey7 | smallint | Column ID of the referencing column. |
| fkey8 | smallint | Column ID of the referencing column. |
| fkey9 | smallint | Column ID of the referencing column. |
| fkey10 | smallint | Column ID of the referencing column. |
| fkey11 | smallint | Column ID of the referencing column. |
| fkey12 | smallint | Column ID of the referencing column. |
| fkey13 | smallint | Column ID of the referencing column. |
| fkey14 | smallint | Column ID of the referencing column. |
| fkey15 | smallint | Column ID of the referencing column. |
| fkey16 | smallint | Column ID of the referencing column. |
| rkey1 | smallint | Column ID of the referenced column. |
| rkey2 | smallint | Column ID of the referenced column. |
| rkey3 | smallint | Column ID of the referenced column. |
| rkey4 | smallint | Column ID of the referenced column. |
| rkey5 | smallint | Column ID of the referenced column. |
| rkey6 | smallint | Column ID of the referenced column. |
| rkey7 | smallint | Column ID of the referenced column. |
| rkey8 | smallint | Column ID of the referenced column. |
| rkey9 | smallint | Column ID of the referenced column. |
| rkey10 | smallint | Column ID of the referenced column. |
| rkey11 | smallint | Column ID of the referenced column. |
| rkey12 | smallint | Column ID of the referenced column. |
| rkey13 | smallint | Column ID of the referenced column. |
| rkey14 | smallint | Column ID of the referenced column. |
| rkey15 | smallint | Column ID of the referenced column. |
| rkey16 | smallint | Column ID of the referenced column. |
See Also
Mapping System Tables to System Views (Transact-SQL)
Compatibility Views (Transact-SQL)