结果包含多行Error 1172 mysql

Question

你好,我很难用这个存储过程.我得到错误:结果由多行组成.

这是我的存储过程:

DELIMITER $$

DROP PROCEDURE IF EXISTS `dss`.`COSTRET` $$
CREATE DEFINER=`dwadmin`@`192.168.%.%` PROCEDURE `COSTRET`( TDATE DATE)
BEGIN
    DECLARE done INT DEFAULT 0;
    DECLARE ls_id VARCHAR(8);
    DECLARE ld_cost DECIMAL(10,4);
      DECLARE ld_retail DECIMAL(10,4);
    DECLARE cur1 CURSOR FOR SELECT DISTINCT `id` FROM `prod_performance` WHERE `psc_week` = TDATE;
    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;

  -- Get the Cost
  CREATE TEMPORARY TABLE IF NOT EXISTS `prod_itemcost`
    SELECT DISTINCTROW `itemcode` ID, `mlist` COST
    FROM (SELECT `itemcode`, `pceffdate`, `mlist`
        FROM `purchcost` a
        where `pceffdate` = (SELECT MAX(z.`pceffdate`) FROM `purchcost` z WHERE z.`itemcode` = a.`itemcode`
        AND z.`pceffdate` <= TDATE)) tb
    ORDER BY `itemcode`;

    OPEN cur1;
    REPEAT
      FETCH cur1 INTO ls_id;
      IF NOT done THEN
            SELECT DISTINCTROW `cost` INTO ld_cost FROM `prod_itemcost` WHERE id = ls_id;

        UPDATE LOW_PRIORITY `prod_performance` SET `current_cost` = ld_cost WHERE `psc_week` = TDATE and `id` = ls_id;
      END IF;
    UNTIL done END REPEAT;
    CLOSE cur1;

   -- Destroy Temporary Tables
   DROP TEMPORARY TABLES IF EXISTS `prod_itemcost`;
END $$

DELIMITER ;

任何解决方案和建议都非常感谢!

Answer 1

我想问题就在这里:

SELECT DISTINCTROW `cost` INTO ld_cost FROM `prod_itemcost` WHERE id = ls_id;

并且由此返回多行.您如何解决它取决于您的要求.例如,是否存在多行意味着数据库需要进行一些清理？或者你应该采用'cost'的第一个值,或者id = ls_id的所有'cost'的总和？

编辑:

您的INTO子句尝试将多行写入单个变量.看看你的SQL,我想说的是潜在的问题是你的初始查询只是为每个ID的最新成本回收而被pceffdate的副本所拖累.如果是这种情况,这个SQL:

SELECT DISTINCTROW `itemcode` ID, `mlist` COST
    FROM (SELECT `itemcode`, `pceffdate`, `mlist`
        FROM `purchcost` a
        where `pceffdate` = (SELECT MAX(z.`pceffdate`) FROM `purchcost` z WHERE z.`itemcode` = a.`itemcode`
        AND z.`pceffdate` <= TDATE)) tb

将返回更多行而不仅仅是:

SELECT DISTINCTROW `itemcode` ID
    FROM (SELECT `itemcode`, `pceffdate`, `mlist`
        FROM `purchcost` a
        where `pceffdate` = (SELECT MAX(z.`pceffdate`) FROM `purchcost` z WHERE z.`itemcode` = a.`itemcode`
        AND z.`pceffdate` <= TDATE)) tb

Answer 2

这条线

SELECT MAX(z.`pceffdate`) FROM `purchcost` z WHERE z.`itemcode` = a.`itemcode`
    AND z.`pceffdate` <= TDATE

一定是问题所在。它必须返回超过 1 行。因此，DBMS 试图为同一事物设置多个值，但这当然是不可能的。

您的 WHERE 子句中还需要其他内容吗？