No estoy seguro de si necesita una verificación de igualdad en diferentes campos (como field1 = field2).
De lo contrario, esto podría ser suficiente.
Editar
dude en ajustar el testdata que nos proporcione entradas que dan una salida mal de acuerdo a sus especificaciones.
Los datos de prueba
DECLARE @Customers TABLE (
customer_number INTEGER IDENTITY(1, 1)
, field1 INTEGER
, field2 INTEGER
, field3 INTEGER
, field4 INTEGER)
INSERT INTO @Customers
SELECT 1, 1, 1, 1
UNION ALL SELECT 1, 1, 1, 1
UNION ALL SELECT 1, 1, 1, NULL
UNION ALL SELECT 1, 1, 1, 2
UNION ALL SELECT 1, 1, 1, 3
UNION ALL SELECT 2, 1, 1, 1
todos iguales
SELECT ROW_NUMBER() OVER (ORDER BY c1.customer_number)
, c1.field1
, c1.field2
, c1.field3
, c1.field4
FROM @Customers c1
INNER JOIN @Customers c2 ON c2.customer_number > c1.customer_number
AND ISNULL(c2.field1, 0) = ISNULL(c1.field1, 0)
AND ISNULL(c2.field2, 0) = ISNULL(c1.field2, 0)
AND ISNULL(c2.field3, 0) = ISNULL(c1.field3, 0)
AND ISNULL(c2.field4, 0) = ISNULL(c1.field4, 0)
un campo diferente
SELECT ROW_NUMBER() OVER (ORDER BY field1, field2, field3, field4)
, field1
, field2
, field3
, field4
FROM (
SELECT DISTINCT c1.field1
, c1.field2
, c1.field3
, field4 = NULL
FROM @Customers c1
INNER JOIN @Customers c2 ON c2.customer_number > c1.customer_number
AND c2.field1 = c1.field1
AND c2.field2 = c1.field2
AND c2.field3 = c1.field3
AND ISNULL(c2.field4, 0) <> ISNULL(c1.field4, 0)
UNION ALL
SELECT DISTINCT c1.field1
, c1.field2
, NULL
, c1.field4
FROM @Customers c1
INNER JOIN @Customers c2 ON c2.customer_number > c1.customer_number
AND c2.field1 = c1.field1
AND c2.field2 = c1.field2
AND ISNULL(c2.field3, 0) <> ISNULL(c1.field3, 0)
AND c2.field4 = c1.field4
UNION ALL
SELECT DISTINCT c1.field1
, NULL
, c1.field3
, c1.field4
FROM @Customers c1
INNER JOIN @Customers c2 ON c2.customer_number > c1.customer_number
AND c2.field1 = c1.field1
AND ISNULL(c2.field2, 0) <> ISNULL(c1.field2, 0)
AND c2.field3 = c1.field3
AND c2.field4 = c1.field4
UNION ALL
SELECT DISTINCT NULL
, c1.field2
, c1.field3
, c1.field4
FROM @Customers c1
INNER JOIN @Customers c2 ON c2.customer_number > c1.customer_number
AND ISNULL(c2.field1, 0) <> ISNULL(c1.field1, 0)
AND c2.field2 = c1.field2
AND c2.field3 = c1.field3
AND c2.field4 = c1.field4
) c
@Ic ¿Es correcto escribir "c.field1 como group_no"? group_no es int y field1 es varchar. ¿Tal vez debería usar algunas tablas temporales? – hgulyan
@hgulyan En realidad es ROW_NUMBER() como group_no. –
@Ic, Sí, ya hice un cambio en eso. Todavía estoy tratando de ejecutar el primer script ... – hgulyan