mysql - 加入后选择汇总

Question

从 UX post 移出

我有 2 个查询，每个查询都汇总了..

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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  

---

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

---

加入它们时，rollup 行被删除，因此我通过使用另一个查询计算 rollup 并将其 union 到末尾来解决它结果

这是现场演示 [sqlfiddle] ，关于我这样做的方式的任何想法(例如最佳实践或性能)，是否有一种方法可以在加入后保留汇总，我不知道。任何指示表示赞赏。

更新

我想要的正确结果集是 fiddle 中的结果。每行包含一天的摘要，来自第一个查询的项目/颜色数量和第二个查询的当天请求数量。汇总将是每个项目/颜色和请求的分类总数。希望我说清楚了:)

Answer 1

我认为“汇总”不会被删除。结果行根本不符合join 条件。你可以试试这个:

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;