MSSQL：如何从另一个表中获取多个值

Question

For a given " CustomerId " I need to get 4 related values from a column (" CompanySales ") in another table.

I have joined the two tables and, with the query below, manage to get 2 " CompanySales " values from the column in the other table.

How do I do this do get 4 values (I need CompanySales for " WeekNumber " = 1,2,3 and 4)

This is the SQL query I have to secure " CompanySales " for " Weeknumber " = 1 and 2:

Declare @TempTable1 table
(
  CustomerID INT,
  CustomerName Varchar (50),
  CompanySales DEC (8,2),
  WeekNumber INT
)
INSERT INTO @TempTable1 ("CustomerID","CustomerName", "WeekNumber")
SELECT     Customer.CustomerID, Customer.CustomerName, Company.WeekNumber, company.Sales 
FROM         Customer INNER JOIN
                  Company ON Customer.CustomerID = Company.CustomerID;
With tblDifference as
(
Select Row_Number() OVER (Order by WeekNumber) as RowNumber,CustomerID,CustomerName, companysales, WeekNumber from @TempTable1
)
Select Top (50) cur.CustomerID, Cur.CustomerName, Cur.WeekNumber as CurrentWeek, Prv.WeekNumber as PreviousWeek, Cur.CompanySales as CurrentSales,     Prv.CompanySales as  PreviousSales, CAST(((Cur.CompanySales-Prv.CompanySales)/Prv.CompanySales)*100 As Decimal(8,2)) as PercentChange from
tblDifference Cur Left Outer Join tblDifference Prv
On Cur.CustomerID=Prv.CustomerID

Where cur.WeekNumber = 1 AND prv.WeekNumber = 2 
Order BY PercentChange ASC

Answer 1

如何在介于1和4之间的cur.WeekNumber之间添加？