將Crystal報表表達式轉換為SQL查詢

Question

如何將下面的Crystal Report表達式更改為SQL Server查詢案例語句？ 任何幫助表示贊賞。

AvgLbsPerWeek

If {@EnoughWeightsSum} < {@FreqForCalcs} then 
    (AvgLbsPerWeek := AvgLbsPerWeek +0;
       0;)  
else If {@EnoughWeightsSum} >= {@FreqForCalcs} then
    (AvgLbsPerWeek := AvgLbsPerWeek +{@AvgByDaySum}/{@EnoughWeightsSum}*{@FreqForCalcs};
       {@AvgByDaySum}/{@EnoughWeightsSum}*{@FreqForCalcs};)

Answer 1

這是一個簡單的CASE語句

SELECT 
  AvgLbsPerWeek = 
    CASE WHEN @EnoughWeightSum < @FreqForCalcs
        THEN AvgPoundsPerWeek
    ELSE 
         AvgPoundsPerWeek + @AvgByDaySum/(@EnoughWeightSum*FreqForCalcs)
             -- I didn't quite understand how the last code fit in
    END
 FROM Table