USE databasename;
GO
SELECT i.name AS IndexName, OBJECT_NAME(ic.OBJECT_ID) AS TableName,
COL_NAME(ic.OBJECT_ID,ic.column_id) AS ColumnName
FROM sys.indexes AS i
INNER JOIN sys.index_columns AS ic
ON i.OBJECT_ID = ic.OBJECT_ID
AND i.index_id = ic.index_id
WHERE i.is_primary_key = 1
Esta consulta extraerá todas las restricciones de clave principal de la base de datos... solo necesita ejecutar esta consulta y escribir el nombre de la base de datos en la primera línea