Question

我的功能出错，但我不知道为什么......

我的（DB2）SQL代码：

CREATE FUNCTION gibX(sseries INTEGER, idd INTEGER) RETURNS Double
 BEGIN
   Declare result Double;
   SELECT ROW_NUMBER() OVER(ORDER BY m.x ASC) AS Row, m.x  INTO result 
   FROM messungen m WHERE m.series=sseries and Row=idd;
   return result;
 END;

ERROR：的

CREATE FUNCTION;
   return result;
;, DRIVER=4.13.80

...并顺利通过。

Answer 1

您无法在row中引用where。一种方法是子查询：

SELECT x INTO result
FROM (SELECT ROW_NUMBER() OVER (ORDER BY m.x ASC) AS Row, m.x  
      FROM messungen m
      WHERE m.series = sseries
     ) m
WHERE Row = idd;

获取sql错误，db2函数错误返回结果

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