在mysql中的多个表中获取不同的月份名称并计算重复值

Question

我可能有三张桌子tbdata,tbdatahw,tbdatamr。在所有表中，名为status 和c42 的字段都是相同的。例如tbdatahw table

喜欢tbdata and tbdatamr table 中的相同字段。字段状态 1 指定绿色，2 指定黄色，c42 指定日期详细信息。我尝试实现的是在 1 月份，所有 3 张桌子中有多少绿色黄色状态。我在工作台中尝试了这个查询

    SELECT  MONTHNAME(c42) MONTH, SUM( case when status = 0 THEN 1 else 0 end) AS red
,SUM( case when status = 1 THEN 1 else 0 end) AS green
,SUM( case when status = 2 THEN 1 else 0 end) AS yellow
FROM  tbdata where  month(c42) is not null group by month(c42)
union all 
SELECT  MONTHNAME(c42) MONTH, SUM(distinct case when status = 0 THEN 1 else 0 end) AS red
,SUM(distinct case when status = 1 THEN 1 else 0 end) AS green
,SUM(distinct case when status = 2 THEN 1 else 0 end) AS yellow
FROM  tbdatamr where  month(c42) is not null group by month(c42)
union all 
SELECT  MONTHNAME(c42) MONTH, SUM(distinct case when status = 0 THEN 1 else 0 end) AS red
,SUM(distinct case when status = 1 THEN 1 else 0 end) AS green
,SUM(distinct case when status = 2 THEN 1 else 0 end) AS yellow
FROM  tbdatahw where  month(c42) is not null group by month(c42);

它给出了像这样的冗余输出

我不希望 2 月份出现两次，但我想将 2 月份的绿色状态值加为 1。我也尝试了distinct 和union，但没有成功。我想要这样的输出

Answer 1

    select month, 
SUM(t.red) as red, 
SUM(t.green) as green, 
SUM(t.yellow) as yellow 
from ( {put your whole query here} ) as t GROUP BY month ORDER BY FIELD(month, 'JANUARY', 'FEBRUARY',{please continue to DECEMBER})