Mysql 如何执行日期列表与现有表的左联接

我有一个表，它包含两列：日期和该日期产生的收入，但是，如果在某个日期没有产生收入，该日期将不会显示在表中，我想显示的是该日期和0作为收入

我尝试了一个在两个日期之间生成日期列表的查询，但是，我找不到如何将此查询与我的表左键联接，因为此日期生成器查询没有id

这是我的表查询：

SELECT CAST(insertDate AS DATE) AS DATE, 
        SUM(timeofcall)*10 as total_Revenue_Generated_from_CallBacks
FROM callcompletion.tbl_calltracking
GROUP BY CAST(insertDate AS DATE);

结果->

DATE          total_Revenue_Generated_from_CallBacks

2019-10-14    2200 
2019-10-15    44000
2019-10-16    4400
2019-10-17    8800
2019-10-24    12100

这是日期生成器查询：

SELECT selected_date FROM (
    SELECT adddate('1970-01-01',t4.i*10000 + t3.i*1000 + t2.i*100 + t1.i*10 + t0.i) selected_date 
    from            
        (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t0,
        (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t1,
        (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t2,
        (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t3,
        (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t4
) v
WHERE selected_date BETWEEN '2019-10-14' AND '2019-10-24'

结果->

selected_date

2019-10-14
2019-10-15
2019-10-16
2019-10-17
2019-10-18
2019-10-19
2019-10-20
2019-10-21
2019-10-22
2019-10-23
2019-10-24

预期成果：

DATE         total_Revenue_Generated_from_CallBacks

2019-10-14    2200    
2019-10-15    44000
2019-10-16    4400
2019-10-17    8800
2019-10-18    0
2019-10-19    0
2019-10-20    0
2019-10-21    0
2019-10-22    0
2019-10-23    0
2019-10-24    12100

---

您需要决定您希望显示的最短和最长日期。除此之外，您只需将生成的日期与原始查询关联：

SELECT d.selected_date AS DATE, ifnull(SUM(c.timeofcall)*10,0) as total_Revenue_Generated_from_CallBacks
FROM (
  SELECT adddate('1970-01-01',t4.i*10000 + t3.i*1000 + t2.i*100 + t1.i*10 + t0.i) selected_date 
  FROM            
    (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t0,
    (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t1,
    (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t2,
    (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t3,
    (SELECT 0 i union select 1 union select 2 union select 3 union select 4 union select 5 union select 6 union select 7 union select 8 union select 9) t4
) as d
  left join callcompletion.tbl_calltracking c on CAST(c.insertDate AS DATE) = d.selected_date
WHERE d.selected_date between '2019-10-14' and '2019-10-24'
GROUP BY d.selected_date;

---

请参见

请参见：感谢您抽出时间回答，但由于某些原因，它不起作用/我将开始日期设置为“2019-10-14”，结束日期设置为“2019-10-24”，未经测试。现在应该可以工作了，因为列名现在是正确的，并且添加了ifnull。顺便说一句，您的日期生成子查询可能有点重，因为它生成了很多日期（从1970-01-01到2243-10-16）。缺少对数据库的引用（callcompletion）。你可以再试一次。如果你仍然有问题，请张贴你得到的错误。