以升序获取最后 10 行 [关闭]

Question

我已经尝试使用标准选择查询的所有现有尝试，方法是嵌套在另一个 SELECT 中，然后使用 ASC，但由于某种原因它无法在我的 JSCharts 中加载。我的代码工作正常，减去顺序：

SELECT `$tableName`.`$patient_idField` , `$tableDataName`.`$patient_idField` , `$tableDataName`.`$resultField` , `$tableName`.`$login_idField`
FROM `$tableName`
JOIN `$tableDataName` ON `$tableName`.`$patient_idField` = `$tableDataName`.`$patient_idField`
COLLATE utf8_general_ci
WHERE `$tableName`.`$login_idField` = $usssName
ORDER BY `$tableDataName`.id DESC LIMIT 10

这是重新排序的尝试，但加载失败：

SELECT * FROM (
SELECT `$tableName`.`$patient_idField` , `$tableDataName`.`$patient_idField` , `$tableDataName`.`$resultField` , `$tableName`.`$login_idField`
FROM `$tableName`
JOIN `$tableDataName` ON `$tableName`.`$patient_idField` = `$tableDataName`.`$patient_idField`
COLLATE utf8_general_ci
WHERE `$tableName`.`$login_idField` = $usssName
ORDER BY `$tableDataName`.id DESC LIMIT 10 ) AS `$tableName` JOIN `$tableDataName` ORDER by `$tableDataName`.id ASC

在没有 PHP 的情况下更新...

SELECT userlist.patient_id, results.patient_id, results.result, userlist.login_id
FROM userlist
JOIN results ON userlist.patient_id = results.patient_id
COLLATE utf8_general_ci
WHERE userlist.login_id = ####
ORDER BY results.id DESC
LIMIT 10 

现在，如果我对 ASC 执行此操作之外的任何操作，它会在 patient_id 的重复项上返回错误。

有效的代码，供以后参考

SELECT  *
FROM (
SELECT userlist.patient_id, results.result, userlist.login_id, results.id
FROM userlist
  JOIN results ON userlist.patient_id = results.patient_id
COLLATE utf8_general_ci
WHERE userlist.login_id = ####
ORDER BY results.id DESC
LIMIT 10 ) temp
ORDER BY id

它涉及删除 SELECT 上的 .patient_id 之一。

Answer 1

嵌套在另一个选择中应该可以；它是怎么失败的？

类似：

select tablenamepatientidfield, tabledatanamepatientidfield, resultfield, loginidfield from (
    SELECT
        `$tableDataName`.id,
        `$tableName`.`$patient_idField` AS tablenamepatientidfield,
        `$tableDataName`.`$patient_idField` AS tabledatanamepatientidfield,
        `$tableDataName`.`$resultField` AS resultfield,
        `$tableName`.`$login_idField` AS loginidfield,
    FROM `$tableName`
    JOIN `$tableDataName` ON `$tableName`.`$patient_idField` = `$tableDataName`.`$patient_idField`
    COLLATE utf8_general_ci
    WHERE `$tableName`.`$login_idField` = $usssName
    ORDER BY `$tableDataName`.id DESC LIMIT 10
) AS descending_select ORDER BY id;

（列名都是可变的并且可能发生冲突（并且不包括 id 本身），这有点尴尬。）

Answer 2

你能做到吗

select * from (
    SELECT `$tableName`.`$patient_idField` 
         , `$tableDataName`.`$patient_idField` 
         , `$tableDataName`.`$resultField` 
         , `$tableName`.`$login_idField`
         ,`$tableDataName`.id
    FROM `$tableName`
      JOIN `$tableDataName` ON `$tableName`.`$patient_idField` 
                             = `$tableDataName`.`$patient_idField`
    COLLATE utf8_general_ci
    WHERE `$tableName`.`$login_idField` = $usssName
    ORDER BY `$tableDataName`.id DESC LIMIT 10 ) t
order by id

试试这个，我已经编辑以更好地反映你实际在做什么

select  *
from (
    SELECT userlist.patient_id, results.result, userlist.login_id
    FROM userlist
      JOIN results ON userlist.patient_id = results.patient_id
    COLLATE utf8_general_ci
    WHERE userlist.login_id = ####
    ORDER BY results.id DESC
    LIMIT 10 ) temp
order by patient_id