MySQL：按同一列中的值查询和分组

我有一个如下的sql表数据。MySQL：按同一列中的值查询和分组

c_type_id | s_id | value 
    1 | 11 | Winx32 
    1 | 12 | Domain1 
    2 | 11 | Winx64 
    2 | 12 | Domain2 
    3 | 11 | Winx32 
    3 | 12 | Domain1 
    4 | 11 | Winx32 
    4 | 12 | Domain2

如何查询和分组以获得以下结果。

countall | platform | domain 
     2 | Winx32 | Domain1 
     1 | Winx64 | Domain2 
     1 | Winx32 | Domain2

来源

2014-07-09 rupeshj

@Illidanek它有点是:-( – Strawberry

SELECT COUNT(*) countall, 
     p.value platform, 
     d.value domain 
FROM mytable p 
JOIN mytable d 
ON  (d.c_type_id, d.s_id) = (p.c_type_id, 12) 
WHERE p.s_id = 11 
GROUP BY 
     d.c_type_id

来源

2014-07-09 09:32:22 Quassnoi

谢谢你，这一个为我工作。 – rupeshj

你需要转动表来获得在单独的列平台和域，然后就可以用COUNT和GROUP BY。

SELECT COUNT(*) AS countall, platform, domain 
FROM (SELECT MAX(CASE WHEN s_id = 11 THEN value END) AS platform, 
      MAX(CASE WHEN s_id = 12 THEN value END) AS domain 
     FROM YourTable 
     GROUP BY c_type_id) AS pivoted 
GROUP BY platform, domain

来源

2014-07-09 09:33:43 Barmar

假设你的表名是 '测试1'，这将是您的解决方案：

SELECT COUNT(*) AS countall, t1a.value AS platform, t1b.value AS domain 
FROM test1 AS t1a 
LEFT JOIN test1 AS t1b 
     ON t1b.c_type_id = t1a.c_type_id 
WHERE t1a.s_id = 11 
    AND t1b.s_id = 12 
GROUP BY t1a.value, t1b.value

在MySQL服务器v5.5.37测试

最好的问候， speedbomb

来源

2014-07-09 09:42:34 speedbomb

MySQL：按同一列中的值查询和分组

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