如何使用在mysql中没有选择字段

Question

我正在使用此查询：

    SELECT  `projects`.*, 
            (SELECT SUM(`amount`) 
            FROM `accountprojectspayment` 
            WHERE `projects_id` = `projects`.`id`) AS `payed`
    FROM `projects`
    INNER JOIN `bids` ON `bids`.`id` = `projects`.`bids_id`
    HAVING `bids`.`amount` >= `payed`

我收到此错误：'having clause

中的未知列'bids.amount'

但如果我将代码更改为：

    SELECT  `projects`.*, `bids`.`amount`,
            (SELECT SUM(`amount`) 
            FROM `accountprojectspayment` 
            WHERE `projects_id` = `projects`.`id`) AS `payed`
    FROM `projects`
    INNER JOIN `bids` ON `bids`.`id` = `projects`.`bids_id`
    HAVING `bids`.`amount` >= `payed`

问题得到解决，但我不想使用选择bids。amount

Answer 1

使用派生表格，例如像这样的东西：

SELECT `DT1`.* 
FROM   (SELECT  `projects`.*, 
                (SELECT SUM(`amount`) 
                FROM `accountprojectspayment` 
                WHERE `projects_id` = `projects`.`id`) AS `payed`                   
        FROM `projects`) AS `DT1`            
INNER JOIN `bids` ON `bids`.`id` = `DT1`.`bids_id`
WHERE `bids`.`amount` >= `DT1`.`payed`;