我对 Access 2010 的查询有什么问题？

Question

我在 Access 2010 (accdb) 上有这个查询，它运行得非常好：

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 不断弹出

的参数值

on_hand

on_hand 是您在

上看到的别名

(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，无法返回您的查询并“逆向工程”到on_hand 所在的位置从。因此，您需要使用 WHERE a.safe_stock > (received - issued) 之类的东西，但它们也是输出列的别名。

所以尝试将整个事情包装成一个子查询，然后应用 WHERE 和 ORDER BY 子句：

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

编辑

上面的建议导致了“查询太复杂”的错误，所以我的下一个建议是将原始查询保存为 [StockCheckBaseQuery] 然后做

SELECT * FROM StockCheckBaseQuery WHERE safe_stock > on_hand ORDER BY item_name

这似乎是成功的。