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 变量分组和排序。

Answer 1

怎么样：

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

或者，如果 saved 的唯一可能值是 1 或 0，则完全从查询中忽略该条件。

Answer 2

应该可以这样做：

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

合并两个 SQL 查询的结果

Combine results of two SQL queries

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union

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