MySQL中的相同值未分组

我在两个单独的表中有两列（都是varchar（45）），它们都有值，比如0123456

我有一个联合查询，它基本上是将两个表中的行堆叠起来

select 
'ISSUED' AS action,
card_match_key AS card_match_key,
count(0) AS CNT
from
dim_consumer_cards
group by 1 , 2 

union 

select 
'REDEEMED' AS action,
card_match_key AS card_match_key,
count(0) AS CNT
from
fct_card_redemptions
group by 1 , 2

然后是第二个查询，它在堆叠的数据上形成交叉表

Select
card_match_key as cardkey,
sum(case when action = 'ISSUED' then CNT else 0 end) as ISSUED,
sum(case when action = 'REDEEMED' then CNT else 0 end) as REDEEMED
from vw_rpt_matchkey1
group by 
card_match_key

我的问题是，我的值没有按相似的值分组（例如0123456）。

---

每个值应该只显示在一行上，但我得到的是两行。

请尝试将第一个查询更改为使用公共子表达式，如下所示：

with (
     select 
     'ISSUED' AS action,
     card_match_key AS card_match_key,
     from
     dim_consumer_cards
     UNION ALL
     select 
     'REDEEMED' AS action,
     card_match_key AS card_match_key,
     from
     fct_card_redemptions) AS combined
select action, card_match_key, count(1) as CNT
from combined
group by 1,2;

---

您需要先执行union操作，然后再执行group by。

如果未对它们进行分组，则它们的值不同。或者结果被读取错误“…然后是第二个查询，它在堆叠的数据上形成交叉表。”此操作应沿所述最终查询中指定的组平滑。