MySQL按分組計數多列

Question

我想計算group by子句中使用的每個不同的組。我使用這個查詢現在：

SELECT language, group, count(*) AS frequency 
FROM bfs 
where firstname <> '' 
GROUP BY language, group 

這使我產生這樣的：

'Language' 'Group'    'Frequency' 
'ARABIC' 'LEBANESE'    1080 
'ARABIC' 'MUSLIM'    40963 
'ARABIC' 'MUSLIM MIDDLE EAST'  349 
'ARABIC' 'MUSLIM NORTH AFRICAN' 549 

我想是：不是語言和組列的每個組合的總頻率，我想知道每種語言和組屬性的多條記錄是如何有

'Language' 'Group' 'Frequency' 'Language Frequency' 'Group Frequency' 
'ARABIC' 'LEBANESE' 1080  42941    1080 

其中語言的頻率代表了「阿拉伯語」作爲其值的行總數;類似的組頻率表示包含'LEBANESE'作爲組頻率的總行數。 任何幫助將不勝感激。

謝謝！

Answer 1

SELECT 
    g.language, g.`group`, g.frequency, 
    gl.language_frequency, gg.group_frequency 
FROM 
     (SELECT language, `group`, COUNT(*) AS frequency 
     FROM bfs 
     WHERE firstname > '' 
     GROUP BY language, `group` 
    ) AS g 
    JOIN 
     (SELECT language, COUNT(*) AS languageFrequency 
     FROM bfs 
     WHERE firstname > '' 
     GROUP BY language 
    ) AS gl 
     ON gl.language = g.language 
    JOIN 
     (SELECT `group`, COUNT(*) AS group_frequency 
     FROM bfs 
     WHERE firstname > '' 
     GROUP BY `group` 
    ) AS gg 
     ON gg.`group`= g.`group` ;