假设我有一个问题要求根据几个条件计算订单数量:-
回答问题的示例查询如下:-
SELECT
COUNT(CASE WHEN Device Type = "A" AND Price < 2 THEN '1' END),
COUNT(CASE WHEN Device Type = "A" AND Price IN (2,3) THEN '1' END),
COUNT(CASE WHEN Device Type = "B" AND Price > 3 THEN '1' END)
FROM table
我的问题是:我如何将其他所有条件的最后一个条件 (4) 算作“其他”?(例如,它可能是设备类型 A 但超过 3 美元或设备类型 B 但低于 3 美元)
我是一个初学者 SQL 用户,所以如果这看起来像是一个直接盯着我看的答案,我深表歉意。
SELECT
COUNT(CASE WHEN DeviceType = 'A' AND Price < 2 THEN '1' END),
COUNT(CASE WHEN DeviceType = 'A' AND Price IN (2,3) THEN '1' END),
COUNT(CASE WHEN DeviceType = 'B' AND Price > 3 THEN '1' END),
COUNT(CASE WHEN (DeviceType = 'A' AND Price < 2)
OR (DeviceType = 'A' AND Price IN (2,3))
OR (DeviceType = 'B' AND Price > 3) THEN NULL ELSE 1 END)
FROM yourTable;