Question

我在Access 2010（accdb）上有这个查询，它完全正常工作：

SELECT b.category_name, a.item_name,  
(SELECT COUNT(*) FROM tbl_stock_receiving AS x WHERE x.safe_stock_id = a.ID) AS received,   
(SELECT COUNT(*) FROM tbl_stock_issuance AS y WHERE y.stock_receiving_id = a.ID) AS issued,
(received-issued) AS on_hand, a.safe_stock  
FROM tbl_safe_stock AS a INNER JOIN tbl_category AS b
ON a.category_id = b.id
ORDER BY a.item_name;

现在，我需要修改它以包含一个简单的WHERE语句

...
ON a.category_id = b.id
WHERE a.safe_stock > on_hand
ORDER BY a.item_name;
...

当我运行查询时，Access会不断弹出

的参数值

on_hand

on_hand是一个别名，你可以在

上看到

(received-issued) AS on_hand

我的查询可能有什么问题？

Answer 1

您已将on_hand定义为输出列的名称，但SQL解析器不够聪明，无法返回您的查询和“逆向工程”，其中{{ 1}}来自。因此，您需要使用类似on_hand的内容，但它们也是输出列的别名。

因此，尝试将整个事件作为子查询包装起来，然后应用WHERE a.safe_stock > (received - issued)和WHERE子句：

ORDER BY

修改

上面的建议导致“查询过于复杂”错误，所以我的下一个建议是将原始查询保存为[StockCheckBaseQuery]，然后执行

SELECT * FROM
(
    SELECT b.category_name, a.item_name,  
    (SELECT COUNT(*) FROM tbl_stock_receiving AS x WHERE x.safe_stock_id = a.ID) AS received,   
    (SELECT COUNT(*) FROM tbl_stock_issuance AS y WHERE y.stock_receiving_id = a.ID) AS issued,
    (received-issued) AS on_hand, a.safe_stock  
    FROM tbl_safe_stock AS a INNER JOIN tbl_category AS b
    ON a.category_id = b.id
)
WHERE safe_stock > on_hand
ORDER BY item_name

这似乎是成功的。

我对Access 2010的查询有什么问题？

1 个答案:

修改