MySQL 按 3 列排序

Question

每次刷新我都会得到随机的“结果”:我不知道为什么......

SELECT  `area`,`subarea1`,`subarea2`
FROM (
    SELECT * 
    FROM users_activa_mutua_analitics
    ORDER BY `area`  ASC 
    LIMIT 100
) AS sub
ORDER BY `subarea1`  IS NOT NULL ASC, `subarea2`  IS NOT NULL ASC
LIMIT 5

我需要订购此表格:

(area) (subarea1) (subarea2)
1           1          1
            1          1
            1          1
                       1
2           2          2
            2          2
            2          2
                       2
""          ""         ""   

Answer 1

不确定您的问题中是否有足够的数据，但阅读字里行间，我已经创建了一个我认为您想要的 SQLFiddle:SQLFiddle如果这是正确的，那么您不需要子查询

    SELECT area, subarea1, subarea2
    FROM users_activa_mutua_analitics
    ORDER BY subarea2 ASC,
        subarea1 IS NULL ASC,
        area IS NULL ASC