Question

我创建以下存储过程来计算百分比，它工作正常，但我总是无法得到确切的结果

例如98.000而不是98.947

CREATE PROCEDURE sp_finger_calc_percent
AS
DECLARE  @no_action decimal(18,4);
DECLARE  @yes_action decimal(18,4);

 SELECT   @no_action = COUNT(*)
FROM         Action INNER JOIN
                      Employee ON Action.b_num = Employee.b_num INNER JOIN
                      Department ON Employee.dep_id = Department.dep_id
WHERE     (Department.dep_id = 50) AND (Action.action = 0);


SELECT   @yes_action= COUNT(*)
FROM       Action INNER JOIN
                      Employee ON Action.b_num = Employee.b_num INNER JOIN
                      Department ON Employee.dep_id = Department.dep_id
WHERE     (Department.dep_id = 50) AND (Action.action = 1);

If(@no_action = 0.00)
 return 100.00
Else return cast( (100.00  *(@yes_action  /@no_action ) )as decimal(18,4)) 
;

DECLARE  @return_status decimal(18,4);
EXEC @return_status = sp_finger_calc_percent
select @return_status;

Answer 1

<强> Procedures in SQL Server can only return INTeger types 即可。你需要一个实值函数来做到这一点，我相信（或者，更好的是，正如其他人指出的那样，你的过程的十进制OUTPUT参数）。

Answer 2

另一种可能是使用参数

Alter PROCEDURE sp_finger_calc_percent(@return_status decimal(18,4) out)
AS
DECLARE  @no_action decimal(18,4);
DECLARE  @yes_action decimal(18,4);

SELECT   @no_action = COUNT(*)
FROM         Action INNER JOIN
                      Employee ON Action.b_num = Employee.b_num INNER JOIN
                      Department ON Employee.dep_id = Department.dep_id
WHERE     (Department.dep_id = 50) AND (Action.action = 0);


SELECT   @yes_action= COUNT(*)
FROM       Action INNER JOIN
                      Employee ON Action.b_num = Employee.b_num INNER JOIN
                      Department ON Employee.dep_id = Department.dep_id
WHERE     (Department.dep_id = 50) AND (Action.action = 1);

If(@no_action = 0.00)
 select @return_status= 100.00
Else select @return_status = cast( (100.00  *(@yes_action  /@no_action ) )as decimal(18,4)) 
;

呼叫

DECLARE  @return_status decimal(18,4);
EXEC  sp_finger_calc_percent @return_status out
select @return_status;

Answer 3

更改为输出参数（如Alex K所述）：

CREATE PROCEDURE sp_finger_calc_percent
    @RETURNVALUE DECIMAL(18,4) OUTPUT
AS
...
If(@no_action = 0.00)
 SET @RETURNVALUE = 100.00
Else SET @RETURNVALUE = cast( (100.00  *(@yes_action  /@no_action ) )as decimal(18,4)) 
;

无法获得精确的小数百分比结果？

3 个答案: