Question

我得到的确切错误是：“where子句中的未知列'trans_paid'”

我的查询（$ from_date和$ to_date格式正确）：

SELECT 
   o.order_id,
   o.order_po_no,
   o.order_ship_date,
   acct.acct_company,
   SUM( ROUND( i.item_qty * i.item_price, 2 ) ) AS item_amount, (
      SELECT SUM( trans_amount )
        FROM transactions
      WHERE order_id = o.order_id
        AND trans_pending =0
        AND trans_date >= '$from_date'
        AND trans_date <= '$to_date'
   ) AS trans_paid
 FROM orders AS o
     INNER JOIN accounts AS acct ON o.acct_id = acct.acct_id
     INNER JOIN items AS i ON o.order_id = i.order_id
   WHERE (o.order_status =7 or o.order_status = 4)
      AND trans_paid IS NOT NULL
      AND acct.is_wholesale =1
      AND acct.acct_company LIKE '%".$_POST['company']."%'
 GROUP BY o.order_id

Answer 1

您无法从WHERE子句中引用SELECT原因中的别名列。如果要对其进行过滤，则必须将其包装在子查询中。

Answer 2

标准SQL不允许您引用WHERE子句中的聚合列。您需要将trans_paid条件移动到HAVING子句才能使其正常工作。

更改

WHERE (o.order_status =7 or o.order_status = 4)
    AND trans_paid IS NOT NULL
    AND acct.is_wholesale =1
    AND acct.acct_company LIKE '%".$_POST['company']."%'
GROUP BY o.order_id

到

WHERE (o.order_status =7 or o.order_status = 4)
    AND acct.is_wholesale =1
    AND acct.acct_company LIKE '%".$_POST['company']."%'
GROUP BY o.order_id
HAVING trans_paid IS NOT NULL

Answer 3

必须在FROM子句中声明要在Where子句中使用的别名...您只需重命名一列，而不是实际重命名对象（如表）。

Answer 4

使用此查询：

SELECT 
   o.order_id,
   o.order_po_no,
   o.order_ship_date,
   acct.acct_company,
   SUM( ROUND( i.item_qty * i.item_price, 2 ) ) AS item_amount,
   trans_paid
   FROM orders AS o
   LEFT JOIN 
   (SELECT SUM( trans_amount ) AS trans_paid
    FROM 
    WHERE trans_pending =0
    AND trans_date >= '$from_date'
    AND trans_date <= '$to_date'
   ) temp
   USING order_id

   INNER JOIN accounts AS acct ON o.acct_id = acct.acct_id
   INNER JOIN items AS i ON o.order_id = i.order_id
   WHERE (o.order_status =7 or o.order_status = 4)
      AND trans_paid IS NOT NULL
      AND acct.is_wholesale =1
      AND acct.acct_company LIKE '%".$_POST['company']."%'
 GROUP BY o.order_id

为什么我收到“未知列”错误？

4 个答案: