组合两个列作为新使用相同的MySQL查询

Question

我想这个MySQL查询该列 -

SELECT pan_1, dp_id, client_id, CONCAT(dp_id,client_id) AS ref, name_s, bonds 
FROM `holding_details` 
WHERE `date` = '2015-10-23' 
AND comp_code = '33' 
AND ref NOT IN 
(SELECT CONCAT(dp_id,client_id) AS ref FROM `promoters` WHERE comp_code = '33') 
GROUP BY pan_1 
ORDER BY bonds DESC 

通过阅读上面的查询，你只需明白什么结果我想要的。我有两个分开的列dp_id和client_id都在同一个表中。我想从'hold_details'表中得到一些结果，除了在dp_id和client_id列的条件下出现在'发起人'表中的结果之外，我将它们合并，因为它使它们成为唯一记录。我试过上面的MySql查询，但它显示“未知列参考”错误。请告诉我，不可能在同一个查询中使用组合列，我该如何实现该结果。由于

Answer 1

不完全回答你的问题，但也许您的问题....
更好地利用NOT EXIST。它有使用索引比你CONCAT（）的方式更好的机会 - 方法....

SELECT 
    pan_1, dp_id, client_id, name_s, bonds 
FROM 
    `holding_details` as hd 
WHERE 
    hd.`date` = '2015-10-23' 
AND 
    hd.comp_code = '33' 
AND 
    NOT EXISTS (
     SELECT 
      * 
     FROM 
      promoters as p 
     WHERE 
      p.comp_code = '33' 
      AND hd.dp_id=p.dp_id 
      AND hd.client_id=p.client_id 
    ) 
GROUP BY 
    pan_1 
ORDER BY 
    bonds DESC 

Answer 2

您可以使用NOT EXISTS：

SELECT pan_1, dp_id, client_id, CONCAT(dp_id,client_id) AS ref, name_s, bonds 
FROM `holding_details` d 
WHERE `date` = '2015-10-23' 
AND comp_code = '33' 
AND NOT EXISTS 
    (SELECT 'x' FROM `promoters` p 
    WHERE p.comp_code = '33' 
     AND p.dp_id = d.dp_id 
     AND p.client_id = d.client_id) 
GROUP BY pan_1 
ORDER BY bonds DESC 

这应该工作了：仅指定两列，并从选择返回两列（不CONCAT！）：

SELECT pan_1, dp_id, client_id, CONCAT(dp_id,client_id) AS ref, name_s, bonds 
FROM `holding_details` 
WHERE `date` = '2015-10-23' 
AND comp_code = '33' 
AND (dp_id, client_id) NOT IN 
    (SELECT dp_id, client_id) AS ref FROM `promoters` WHERE comp_code = '33') 
GROUP BY pan_1 
ORDER BY bonds DESC 

你自己如果你不使用别名ref，而是使用表达式本身，那么尝试也可能会奏效。不过，我更喜欢上面的那个。因为使用索引，Concatting使其不那么清晰和效率低下。上面的查询可以非常有效，如果你有正确的索引。无论如何，那就是：

SELECT pan_1, dp_id, client_id, CONCAT(dp_id,client_id) AS ref, name_s, bonds 
FROM `holding_details` 
WHERE `date` = '2015-10-23' 
AND comp_code = '33' 
AND CONCAT(dp_id,client_id) NOT IN 
(SELECT CONCAT(dp_id,client_id) AS ref FROM `promoters` WHERE comp_code = '33') 
GROUP BY pan_1 
ORDER BY bonds DESC 

Answer 3

尝试此查询，

SELECT pan_1, hd.`dp_id`, hd.`client_id`, CONCAT(hd.`dp_id`,hd.`client_id`) AS ref, name_s, bonds 
FROM `holding_details` as hd 
LEFT JOIN `promoters` as p on p.`dp_id` = hd.`dp_id` AND p.`client_id` = hd.`client_id` 
WHERE hd.`date` = '2015-10-23' 
AND hd.`comp_code` = '33' 
AND p.`dp_id` <> hd.`dp_id` 
AND p.`client_id` <> hd.`client_id` 
GROUP BY pan_1 
ORDER BY bonds DESC