mysql - 使用具有不同随机子查询结果的 GroupBy 随机化 MySQL 中的 Select SubQuery

Question

如何为同一国家/地区显示不同的 members.name，当前是否为同一国家/地区显示相同的 members.name，但每次查询执行时显示不同的。

基于上一个问题:Randomizing Select subquery in MySQL when using GroupBy

查询:

 SELECT 
        country.guid,
        country.Name AS 'country name',
        country.Area_id,
        country_cities.guid,
        country_cities.name AS 'city name',
        country_streets.guid,
        country_streets.name AS 'country streets',
        memebers.name.guid,
        memebers.name AS 'street members'
    FROM
        country
            JOIN
        (SELECT 
            RAND() as seed, country_id, guid, name
        FROM
            street_members GROUP BY seed, name, guid,country_id ORDER BY seed) memebers ON memebers.country_id = country.id
            JOIN
        country_cities ON country_cities.country_id = country.id
            JOIN
        country_streets ON country_streets.city_id = country_cities.id
    GROUP BY country.guid , country_cities.guid , country_streets.guid
    ORDER BY RAND()
    LIMIT 0 , 100

Answer 1

如上一个问题所示，country_streets 和 street_members 之间没有直接链接，因此我只看到以下解决方案:

SELECT 
        country.guid,
        country.Name AS 'country name',
        country.Area_id,
        country_cities.guid,
        country_cities.name AS 'city name',
        country_streets.guid,
        country_streets.name AS 'country streets',
        memebers.name.guid,
        memebers.name AS 'street members'
    FROM
        country
            JOIN
        country_cities ON country_cities.country_id = country.id
            JOIN
        country_streets ON country_streets.city_id = country_cities.id
            JOIN
        (SELECT 
            RAND() as seed, country_id, city_id, cs.id as streets_id, guid, name
         FROM
            street_members sm 
            JOIN country_cities cc ON sm.country_id = cc.country_id 
            JOIN country_streets cs ON cs.city_id = cc.country_id 
         GROUP BY seed, name, guid,country_id,city_id,streets_id ORDER BY seed
        ) memebers ON memebers.streets_id=country_streets.id
    GROUP BY country.guid , country_cities.guid , country_streets.guid
    ORDER BY RAND()
    LIMIT 0 , 100

同样，它没有在您的特定数据库上进行测试(并且肯定可以到处改进)，但您明白了。