How to get Parent Table, Reference Table, Foreign Key Constraint Name and Columns in SQL Server - SQL Server / TSQL Tutorial Part 71

Scenario:

You are working as SQL Server Developer, you are asked to provide the query that should return all the parent tables, reference tables, Foreign Key Constraints and Columns used in Foreign Key Constraint definition.

Solution:

We can use the system views to gather this information. In our below query we will be using three

system views
sys.foreign_keys
sys.foreign_key_columns
sys.columns 

to answer the request. As we can have composite primary key columns used in Foreign Key Constraint, I have used FOR XML Path to concatenate rows into column so can provide list of columns in single row.

;With CTE_FK AS (
SELECT Schema_Name(Schema_id) as TableSchemaName,
  object_name(FK.parent_object_id) ParentTableName,
  object_name(FK.referenced_object_id) ReferenceTableName,
  FK.name AS ForeignKeyConstraintName,c.name as ReferencedColumnList,
  cf.name as ParentColumnName 
FROM sys.foreign_keys AS FK
INNERJOIN sys.foreign_key_columns AS FKC
ON FK.OBJECT_ID = FKC.constraint_object_id
INNERJOIN sys.columns c
on  c.OBJECT_ID = FKC.referenced_object_id
AND c.column_id = FKC.referenced_column_id
INNERJOIN sys.columns cf
on  cf.OBJECT_ID = FKC.parent_object_id
AND cf.column_id = FKC.parent_column_id
                 )
Select TableSchemaName,
                 ParentTableName,
                 ReferenceTableName,
                 ForeignKeyConstraintName,stuff((
Select','+ParentColumnName
from CTE_FK i
where i.ForeignKeyConstraintName=o.ForeignKeyConstraintName
and i.TableSchemaName=o.TableSchemaName
and i.ParentTableName=o.ParentTableName
and i.ReferenceTableName=o.ReferenceTableName
for xml path('')), 1, 1, '') ParentColumnList
                 ,stuff((
Select','+ReferencedColumnList
from CTE_FK i
where i.ForeignKeyConstraintName=o.ForeignKeyConstraintName
and i.TableSchemaName=o.TableSchemaName
and i.ParentTableName=o.ParentTableName
and i.ReferenceTableName=o.ReferenceTableName
for xml path('')), 1, 1, '') RefColumnList
from CTE_FK o
groupby
                 tableSchemaName,
                 ParentTableName,
                 ReferenceTableName,
                 ForeignKeyConstraintName

I executed above script on one of my database and here is output with Schema Name,Parent Table Name, Referenced Table Name, Foreign Key Constraint Name, Parent Column List and Reference Column List used in Constraint.

How to get Parent Table, Referenced Table,Foreign Key Constraint Name, Columns list in SQL Server