do a "order by DESC or ASC" in a union with different columns - sql

Question

Good day I need to sort by the Fecha column but when using order by I can not because the select in the union does not have the same columns. how could you sort by this field Fecha. Can you please help me solve this?
e.g. as below.
Below is the query i am using.
SELECT 'PESO:','VOLUMEN:','NO. PIEZAS:','ETD:','ETA:'
UNION ALL
SELECT
(SELECT ISNULL(Valor,'') FROM MovCampoExtra WHERE Modulo = 'VTAS' AND ID = Venta.ID AND CampoExtra = 'CEDIS0103') AS pesoBruto,
(SELECT ISNULL(Valor,'') FROM MovCampoExtra WHERE Modulo = 'VTAS' AND ID = Venta.ID AND CampoExtra = 'CEDIS0121') AS volumen,
(SELECT ISNULL(Valor,'') FROM MovCampoExtra WHERE Modulo = 'VTAS' AND ID = Venta.ID AND CampoExtra = 'CEDIS0102') AS cantidadUnidades,
(SELECT CEDIS0120 FROM VentaCampoExtra WHERE ID = Venta.ID) AS ETD,
(SELECT CEDIS0123 FROM VentaCampoExtra WHERE ID = Venta.ID) AS ETA
FROM Venta
--Venta AS v
INNER JOIN Cte AS c ON c.Cliente = Venta.Cliente
INNER JOIN Usuario us On us.Usuario = Venta.Usuario
WHERE
#Origen=Venta.TMLICentroCosto AND
Venta.Mov IN ('Instruccion EXPO', 'Instruccion IMPO','Instruc. Nacional')
AND Venta.Empresa IN ('TM')
AND Venta.ID is NOT NULL
AND Venta.Estatus NOT IN ('Cancelado')
UNION ALL
SELECT 'FECHA:','HORA:','ACTIVIDADES:',' ',' '
UNION ALL
SELECT
Fecha = ISNULL(CONVERT(VARCHAR, mb.Fecha, 103),''), -- AS Fecha,
Hora = ISNULL(CONVERT(VARCHAR, mb.Fecha, 108),''), -- AS Hora,
Comentarios = ISNULL(mb.Evento2,''),
'',
''
FROM Venta
--Venta AS v
INNER JOIN Cte AS c ON c.Cliente = Venta.Cliente
LEFT OUTER JOIN MovBitacora AS mb ON mb.ID = Venta.ID
INNER JOIN Usuario us On us.Usuario = Venta.Usuario
WHERE
#Origen=Venta.TMLICentroCosto AND
Venta.Mov IN ('Instruccion EXPO', 'Instruccion IMPO','Instruc. Nacional')
AND Venta.Empresa IN ('TM')
AND Venta.ID is NOT NULL
AND Venta.Estatus NOT IN ('Cancelado')
ORDER BY Fecha ASC
RETURN
END

Answer 1

Okay so moaning out the way first, this is a horrible way to do things. You should not be returning header columns from the sql query, and hacking together two unrelated queries. This should be two queries called by the application layer, which should also be handling the headers.
But if you have to do it this way for some arcane reason, you could add a "sorting" column to each query
Header 1 sortval = A
Peso query sortval = B + Peso
Header 2 sortval = C
Fecha query sortval = D + Fecha (in YYYYMMDD format)
Then add a big select round the whole thing to select the columns (which you will need to add aliases for in the first header select) and order by the sortval.