SQL Server Dateadd - selectクエリのelseとの間隔を取得しますか？

Question

「週刊」または「月刊」可能な周波数範囲（NVARCHAR）に応じて、私は

SELECT rs.ScheduledStartDate, rs.ScheduledEndDate, rs.Frequency, rs.FreqRange, rs.LastCreated 
FROM RosterSchedule rs 
WHERE dateadd(case when rs.FreqRange = 'Weekly' Then day else month end), rs.Frequency, rs.LastCreated) = GETDATE() 

Answer 1

私は比較の順序を逆に考える：

WHERE CAST(GETDATE() AS DATE) = CASE 
           WHEN rs.FreqRange = 'Weekly' THEN DATEADD(Week, rs.Frequency, rs.lastcreated) 
           WHEN rs.FreqRange = 'Monthly' THEN DATEADD(Month, rs.Frequency, rs.lastcreated) 
           ELSE '1/1/1900' -- Adjust this as needed 
           END 

Answer 2

DATEADD関数の間隔を設定するために、結果を使用したいが、おそらく

のようなものであるべき

… 
WHERE 
    CASE 
    WHEN rs.FreqRange = 'Weekly' THEN DATEADD(WEEK, rs.Frequency, rs.LastCreated) 
    WHEN rs.FreqRange = 'Monthly' THEN DATEADD(MONTH, rs.Frequency, rs.LastCreated) 
    END = today