選擇彙總後加入

Question

從UX post

感動我有2個疑問，在每一個捲起來..

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SELECT DATE(date) AS day, 
     COUNT(IF(name = 'red', 1, NULL)) AS "red", 
     COUNT(IF(name = 'blue', 1, NULL)) AS "blue", 
     COUNT(IF(name = 'yellow', 1, NULL)) AS "yellow" 
    FROM test1 
GROUP BY day with rollup 

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SELECT DATE(date) AS day, 
     COUNT(*) AS total 
    FROM test2 
GROUP BY day with rollup 

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當加入他們rollup行被刪除，所以我通過使用另一個來解決它查詢計算rollup和union它的結果

這裏結束的現場演示 [sqlfiddle]，約我做的方式有什麼想法這（最喜歡的練習或表演），如果有一種方法來保持rollup後加入，我不知道。任何指針讚賞。

更新

我想要的正確結果集是小提琴的結果。每行包含一天的摘要，從第一個查詢項目/顏色數量和第二個查詢當天的請求數量。彙總將是每個項目/顏色和請求的分類總數。希望我明確了:)

Answer 1

我不認爲「彙總」被刪除。結果行不符合join的條件。你可以試試這個：

select t1.*, t2.total 
from (SELECT date(date) as day, count(IF(name = 'red', 1, NULL)) AS "red", 
      sum(name = 'blue') AS blue, 
      sum(name = 'yellow') AS yellow 
     FROM test1 
     group by day with rollup 
    ) t1 join 
    (select date(date) as day, count(*) as total 
     from test2 
     group by day with rollup 
    ) t2 
    on t1.day = t2.day or t1.day is null and t2.day is null;