Question

获取上述错误。

我尝试将while循环中的wheres切换为haves，但是没有运气。我不知道是否在while循环中正在破坏事物还是什么？

目标是使用equip_ava temp表中存储的数据来赌一张包含可用物品的表格，并根据发票是否减去该物品而减去。

BEGIN
DECLARE s int(5);
DECLARE m int(5);
DECLARE o date;
DECLARE i date;
DECLARE a int(3);
DECLARE e int(3);

DROP TABLE IF EXISTS equip_out;
CREATE TEMPORARY TABLE equip_out
SELECT line_items.invoice_number,date_out,date_due_in,equipment_qty,line_items.equipment_id FROM invoices join line_items
group by Sequence;

DROP TABLE IF EXISTS equip_ava;
CREATE TEMPORARY TABLE equip_ava
SELECT equipment_id,equipment_total FROM equipment
GROUP BY equipment_id;

SET @s = 1;
SET @m = MAX(line_items.Sequence);
    WHILE @s <= @m DO
        SELECT date_out INTO @o FROM invoices join line_items
            WHERE Sequence=@s
            GROUP BY Sequence;

        SELECT date_due_in INTO @i FROM invoices join line_items
            WHERE Sequence=@s
            GROUP BY Sequence;

        IF daily BETWEEN @o AND @i THEN
            SELECT equipment_qty INTO @a FROM line_items
            WHERE Sequence=@s
            GROUP BY Sequence;

            SELECT equipment_id INTO @e FROM line_items
            WHERE Sequence=@s
            GROUP BY Sequence;

            UPDATE equip_ava
            SET equipment_total=equipment_total-@a
            WHERE equipment_id=@e;
        END IF;
        SET @s=@s+1;
    END WHILE;
    SELECT * FROM equip_ava;

END

Answer 1

发现问题需要更改

SET @m = MAX(line_items.Sequence);

到

SELECT @m = MAX(line_items.Sequence) FROM line_items;

Answer 2

您不能在存储过程（或任何SET语句）中直接使用聚合函数；它必须是SELECT的一部分。您需要将该行更改为

SET @m = (SELECT MAX(Sequence) FROM line_items);

或

SELECT MAX(Sequence) INTO @m FROM line_items;

请注意，您已经声明了很多变量，但实际上并未使用它们。 @s是全局变量，s是过程中的局部变量。

错误代码：1111。在存储过程中无效使用组功能

2 个答案: