NULLを返す単純な数学的ストアドプロシージャ？

Question

このストアドプロシージャがNULL（SQL Server 2005を使用しています）を返す理由を他の人に教えてもらえますか？助けてくれてありがとう。

CREATE PROCEDURE calc_runningtotal_averageprice_realisedpl 
    @filled_size    REAL, 
    @reported_execution   REAL, 
    @old_running_total   REAL, 
    @old_average_price   REAL, 
    @new_running_total   REAL OUTPUT, 
    @new_average_price   REAL OUTPUT, 
    @realised_pl    REAL OUTPUT 
AS 
BEGIN 

    SET @new_running_total = @old_running_total + @filled_size 
    SET @realised_pl = 0 
    IF SIGN(@filled_size) = SIGN(@old_running_total) 
     BEGIN 
      SET @new_average_price = (@filled_size * @reported_execution + @old_running_total * @old_average_price)/(@new_running_total) 
     END 
    ELSE 
     BEGIN 
      DECLARE @quantity   REAL 
      IF ABS(@reported_execution) < ABS(@old_running_total) 
       SET @quantity = ABS(@reported_execution) 
      ELSE 
       SET @quantity = ABS(@old_running_total); 


      SET @realised_pl = (@reported_execution - @old_average_price) * @quantity * SIGN(@filled_size) * -1; 
      SET @new_average_price = 
       CASE 
        WHEN ABS(@filled_size) < ABS(@old_running_total) THEN @old_average_price 
        WHEN ABS(@filled_size) = ABS(@old_running_total) THEN 0 
        WHEN ABS(@filled_size) > ABS(@old_running_total) THEN @reported_execution 
       END 
     END 
END 

私は次のことを実行する場合、私は3 NULLS

DECLARE @new_running_total  REAL 
DECLARE @new_average_price  REAL 
DECLARE @realised_pl   REAL 

EXEC calc_runningtotal_averageprice_realisedpl 1, 1, 2, 2, @new_running_total, @new_average_price, @realised_pl 
SELECT @new_running_total, @new_average_price, @realised_pl 

を取得し、私は3、1.66666のようなものを期待しています、0

Answer 1

あなたは単にと呼び出しで出力パラメータを飾るされていませんOUTPUT：

EXEC calc_runningtotal_averageprice_realisedpl 1, 1, 2, 2, 
    @new_running_total OUTPUT, 
    @new_average_price OUTPUT, 
    @realised_pl OUTPUT