左连接失败，在条款

上的未知列我有两个查询运行在同一个表上，除了第二个失败并添加了一个左连接。左连接失败，在条款

成功运行

SELECT * 
FROM paypal_ipn_orders 
LEFT join itemkey on paypal_ipn_orders.item_number = itemkey.item_id 
WHERE packing_slip_printed = 0 
AND LOWER(payment_status) = 'completed' 
AND address_name <> '' 
order by itemkey.sort_id;

然而，这第二个查询用“‘关于条款’在未知列‘paypal_ipn_orders.item_number’”失败，但它运行良好与开出左侧加入。 Paypal_ipn_orders表包含item_number字段。

SELECT * 
FROM paypal_ipn_orders as table1, 
(SELECT payer_email, COUNT(*) as count FROM paypal_ipn_orders GROUP BY payer_email ORDER BY count DESC) as table2 
LEFT join itemkey on table1.item_number = itemkey.item_id 
WHERE table1.payer_email = table2.payer_email 
and packing_slip_printed = 0 
AND LOWER(payment_status) = 'completed' 
AND address_name <> '' 
ORDER BY count DESC, auction_multi_item, item_number;

表1后的逗号是必需的，因为（SELECT ...是FROM子句的一部分

一个有趣的注意，我改变的顺序FROM子句：。

SELECT * 
FROM (SELECT payer_email, COUNT(*) as count FROM paypal_ipn_orders GROUP BY payer_email ORDER BY count DESC) as table1, 
paypal_ipn_orders as table12 
LEFT join itemkey on table2.item_number = itemkey.item_id 
WHERE table2.payer_email = table1.payer_email 
and packing_slip_printed = 0 
AND LOWER(payment_status) = 'completed' 
AND address_name <> '' 
ORDER BY count DESC, auction_multi_item, item_number;

现在的错误信息是：'where clause'中的未知列'table2.payer_email'。但是这将不会在左连接外运行。给出where子句消息中的同一未知列。

仅供参考 - 这工作：

SELECT payer_email, COUNT(*) as count 
FROM paypal_ipn_orders 
WHERE packing_slip_printed = 0 
AND LOWER(payment_status) = 'completed' 
AND address_name <> '' 
GROUP BY payer_email 
ORDER BY count DESC;

来源

2013-02-24 LeRoy Grubbs

FROM paypal_ipn_orders table1,

你的意思是... FROM paypal_ipn_orders AS table1 (...？

另请注意，逗号在table1,的末尾。我不确定这是否是有意的？

来源

2013-02-24 02:27:25

对不起，它无法同我们没有“‘为’表1”我也曾尝试表名“paypal_ipn_orders”具有相同的结果。 – 2013-02-24 13:30:58

好的，如果您仍然遇到问题，我会稍后再仔细研究。 – 2013-02-24 17:15:20

谢谢约翰，对我来说这仍然是一个神秘的东西。 – 2013-02-24 17:56:21

这到底是什么工作：

SELECT * 
     FROM (SELECT payer_email, COUNT(*) as count 
      FROM paypal_ipn_orders 
      Where packing_slip_printed = 0 
      AND LOWER(payment_status) = 'completed' 
      AND address_name <> '' 
      GROUP BY payer_email 
      ORDER BY count DESC) as table1, 
     paypal_ipn_orders as table2 
     LEFT join itemkey on table2.item_number = itemkey.item_id 
     WHERE table1.payer_email = table2.payer_email 
     and packing_slip_printed = 0 
     AND LOWER(payment_status) = 'completed' 
     AND address_name <> '' 
     ORDER BY count DESC, auction_multi_item, sort_id

来源

2013-02-26 00:27:32

感谢发布！对不起，我没有机会看，但我很高兴你明白了。 – 2013-02-27 18:42:53

左连接失败，在条款

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