合并两个 SQL 查询的结果

Question

我想将两个查询的结果合并为一个resulttable 三个列，result1、result2 和dateday，查询是矛盾的

SELECT COUNT( DISTINCT `cust` ) AS result1, DATE( `date` ) AS dateday
FROM `salg_test`
WHERE `saved` =0
AND `is_void` =0
GROUP BY dateday
ORDER BY dateday DESC

SELECT COUNT( DISTINCT `cust` ) AS result2, DATE( `date` ) AS dateday
FROM `salg_test`
WHERE `saved` =1
AND `is_void` =0
GROUP BY dateday
ORDER BY dateday DESC

我希望两个结果都按dateday 变量进行分组和排序。

Answer 1

应该可以做这样的事情：

SELECT COUNT( DISTINCT CASE `saved` when 0 then `cust` else null end ) AS result1
, COUNT( DISTINCT CASE `saved` when 1 then `cust` else null end ) AS result2
, DATE( `date` ) AS dateday
FROM `salg_test`
WHERE `is_void` =0
GROUP BY dateday
ORDER BY dateday DESC

Answer 2

怎么样：

WHERE (`saved`= 1 OR `saved`= 0)

或者，如果 saved 的唯一可能值是 1 或 0，则从查询中完全省略该条件。