SQL - Query con select para hacer un update masivo

-- Target Table

DECLARE @tgt TABLE (OrdID INT, ItemID INT, Qty INT, Price MONEY);

INSERT INTO @tgt (OrdID, ItemID, Qty, Price)

    SELECT 1, 100, 10, 10.00 UNION ALL

    SELECT 1, 101, 10, 12.00

OrdID       ItemID      Qty         Price

----------- ----------- ----------- ---------------------

1           100         10          10.00

1           101         10          12.00

-- Source Table

DECLARE @src TABLE (OrdID INT, ItemID INT, Qty INT, Price MONEY);

INSERT INTO @src (OrdID, ItemID, Qty, Price)

    SELECT 1, 100, 12, 10.00 UNION ALL

    SELECT 1, 102, 10, 12.00 UNION ALL

    SELECT 1, 103, 5, 7.00

OrdID       ItemID      Qty         Price

----------- ----------- ----------- ---------------------

1           100         12          13.00

1           102         10          12.00

1           103         5           7.00

MERGE @tgt AS t

USING @src AS s

ON t.OrdID = s.OrdID AND t.ItemID = s.ItemID

WHEN MATCHED THEN

  UPDATE SET

    t.Qty = s.Qty,

    t.Price = s.Price;

UPDATE c_persona

SET grupomenu='2', grupotrabajo='12'

FROM c_persona CP inner join c_usuario CU on CP.cvepersona = CU.cvepersona  --- desconozco que columna une a las tablas

WHERE CP.matricula  LIKE = '2015% '