php - 选择组数据并按从低到高的顺序排列数据

Question

表中有数据 tbltest就像下面这样

    +---------------+--------------+
    | customfieldid | fieldvalue   |
    +---------------+--------------+
    |             1 | 3            |
    |             1 | 7            |
    |             3 | 5            |
    |             3 | 1            |
    |             4 | 5            |
    +---------------+--------------+

我想从此表中选择数据并按 customfieldid 分组订购方式 fieldvalue asc

Answer 1

如果您想要第一个排序依据而不是分组依据:-

Select * From
(SELECT customerfieldid, fieldvalue FROM tbltest
ORDER BY fieldvalue ASC ) new 
GROUP BY new.customefieldid

或者如果您想要第一个分组依据而不是排序依据:-

SELECT `customerfieldid`, `fieldvalue`
FROM `tbltest` 
GROUP BY `customfieldid` 
ORDER BY `fieldvalue` ASC