1

这是程序:

CREATE OR REPLACE PROCEDURE GetBestSellingMovieByTimeId(timeId IN NUMBER) IS
  movieName Movie.Name%type;
  saleValue Sales.SaleValue%type;
BEGIN
SELECT * INTO movieName, salevalue FROM (
  SELECT m.Name, SUM(s.SaleValue) AS TotalSales 
    FROM Sales s 
    INNER JOIN Movie m ON s.MovieId = m.MovieId 
    WHERE s.TimeId = timeId 
    GROUP BY m.Name ORDER BY TotalSales DESC
  ) WHERE ROWNUM = 1;
  dbms_output.put_line(movieName ||', ' || saleValue);
END;
/
exec GetBestSellingMovieByTimeId(2);

这是错误:

Error starting at line 190 in command: exec GetBestSellingMovieByTimeId(2) 
Error report: 
 ORA-06502: PL/SQL:numeric or value error: number precision too large
 ORA-06512: at "CM420B17.GETBESTSELLINGMOVIEBYTIMEID", line 5 
 ORA-06512: at line 1
06502. 00000 -  "PL/SQL: numeric or value error%s"
 *Cause:    
 *Action:

TimeID 是 Sales 表上的 NUMBER(2,0) FK。将数字 2 传递给过程不应超出 NUMBER(2,0) 数据类型的范围。

为什么这个程序认为IN参数太大了?

4

1 回答 1

3

您的查询选择定义为 SUM(s.SaleValue)的变量。saleValueSales.SaleValue%type

通常使用%type语法是一种很好的做法,但只有当它与分配的值匹配时。如果Sales.SaleValue用比例和精度定义,那么该列的 SUM() 很可能会超出该定义的范围。就像这里的情况一样。

于 2013-07-23T07:09:27.750 回答