SQL Where条件的年数

Question

Declare int @NumberofPriorYears=2;
Declare int @currentYear=2014;

SELECT
 *
FROM
MyTable a
WHERE
a.FiscalYear in (

When @NumberofPriorYears is 2 then i want to pass @currentYear-@NumberofPriorYears (ie 2014,2013,2012) or when @NumberofPriorYears is null then pass @currentYear ie 2014.

Appreciate any help on this.

Answer 1

Try this

Declare int @numberofyears=2;
Declare int @currentYear=2014;

set @currentYear = datepart(year,getdate())


SELECT
 *
FROM
MyTable a
WHERE
datepart(year,a.FiscalYear) between @currentYear and @currentYear+@numberofYears

Answer 2

SELECT *
FROM MyTable a
WHERE @currentYear - a.FiscalYear <= ISNULL(@numberOfPriorYears, 0)

If you want to be able to pass in a previous year instead of just the current year (eg see 2011-2012 instead of 2011-2014) you can use BETWEEN

WHERE a.FiscalYear BETWEEN @currentYear - ISNULL(@numberOfPriorYears, 0) AND @currentYear

Answer 3

Declare int @numberofyears=2;
Declare int @currentYear=2014;

SELECT *
FROM  MyTable a
WHERE
    ( YEAR(a.FiscalYear) >= YEAR(GETDATE()) -  @numberofyears
      AND 
      @numberofyears IS NOT NULL
    )
OR
 ( YEAR(a.FiscalYear) = YEAR(GETDATE())
    AND 
    @numberofyears IS NULL
  )

Answer 4

Can you use a range?

a.FiscalYear >= @currentYear-isnull(@NumberofPriorYears,0)
and a.FiscalYear < @currentYear+1