Tengo una tabla que tiene este esquemaGrupo de SQL Server Por Mes
ItemID UserID Year IsPaid PaymentDate Amount
1 1 2009 0 2009-11-01 300
2 1 2009 0 2009-12-01 342
3 1 2010 0 2010-01-01 243
4 1 2010 0 2010-02-01 2543
5 1 2010 0 2010-03-01 475
que estoy tratando de conseguir un trabajo de consulta que muestra los totales para cada mes. Hasta ahora he probado DateDiff y selecciones anidadas, pero ninguno me da lo que quiero. Este es el más cercano que tengo que pienso:
DECLARE @start [datetime] = 2010/4/1;
SELECT ItemID, IsPaid,
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 And DateDiff(m, PaymentDate, @start) = 0 AND UserID = 100) AS "Apr",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =1 AND UserID = 100) AS "May",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =2 AND UserID = 100) AS "Jun",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =3 AND UserID = 100) AS "Jul",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =4 AND UserID = 100) AS "Aug",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =5 AND UserID = 100) AS "Sep",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =6 AND UserID = 100) AS "Oct",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =7 AND UserID = 100) AS "Nov",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =8 AND UserID = 100) AS "Dec",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =9 AND UserID = 100) AS "Jan",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =10 AND UserID = 100) AS "Feb",
(SELECT SUM(Amount) FROM Payments WHERE Year = 2010 AND DateDiff(m, PaymentDate, @start) =11 AND UserID = 100) AS "Mar"
FROM LIVE L INNER JOIN Payments I ON I.LiveID = L.RECORD_KEY
WHERE UserID = 16178
Pero apenas consigo nulos cuando debería estar recibiendo valores. ¿Me estoy perdiendo de algo?
¿Está tratando de pivotar la tabla para mostrar columnas por año/mes con una suma de pagos por ID de usuario debajo de ella? – William
¿Por qué su UserID = 16178 en la cláusula where diferente de UserID = 100 en su subconsulta where clause? También las últimas 3 subconsultas para enero, febrero y marzo, ¿son sus diferencias de mes de abril realmente 9, 10 y 11 respectivamente? –
Posible duplicado de [Cómo agrupar por mes desde el campo Fecha usando sql] (http://stackoverflow.com/questions/14565788/how-to-group-by-month-from-date-field-using-sql) – kurast