Použijte OBJECT_SCHEMA_NAME
SELECT
OBJECT_SCHEMA_NAME(f.parent_object_id) AS TableNameSchema, -- this
OBJECT_NAME(f.parent_object_id) AS TableName,
COL_NAME(fc.parent_object_id,fc.parent_column_id) AS ColumnName,
OBJECT_SCHEMA_NAME(f.referenced_object_id) AS ReferenceTableNameSchema,
OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName,
COL_NAME(fc.referenced_object_id,fc.referenced_column_id) AS ReferenceColumnName,
f.name AS ForeignKey
FROM
sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc ON f.OBJECT_ID = fc.constraint_object_id
INNER JOIN sys.objects AS o ON o.OBJECT_ID = fc.referenced_object_id