这个CASE语句有什么问题：它不是SUM？

Question

在CASE语句中未对温度场INT（11）求和：

SELECT storenumber as storenumber,
  SUM((CASE temperature WHEN temperature <  0              THEN SumOfTotalPrice ELSE 0 END)) AS Under0,
  SUM((CASE temperature WHEN temperature BETWEEN  0 AND 20 THEN SumOfTotalPrice ELSE 0 END)) AS `0To20`,
  SUM((CASE temperature WHEN temperature BETWEEN 21 AND 30 THEN SumOfTotalPrice ELSE 0 END)) AS `21To30`,
  SUM((CASE temperature WHEN temperature BETWEEN 31 AND 40 THEN SumOfTotalPrice ELSE 0 END)) AS `31To40`,
  SUM((CASE temperature WHEN temperature BETWEEN 41 AND 50 THEN SumOfTotalPrice ELSE 0 END)) AS `41To50`,
  SUM((CASE temperature WHEN temperature BETWEEN 51 AND 60 THEN SumOfTotalPrice ELSE 0 END)) AS `51To60`,
  SUM((CASE temperature WHEN temperature BETWEEN 61 AND 70 THEN SumOfTotalPrice ELSE 0 END)) AS `61To70`,
  SUM((CASE temperature WHEN temperature BETWEEN 71 AND 80 THEN SumOfTotalPrice ELSE 0 END)) AS `71To80`,
  SUM((CASE temperature WHEN temperature BETWEEN 81 AND 90 THEN SumOfTotalPrice ELSE 0 END)) AS `81To90`,
  SUM((CASE temperature WHEN temperature > 90              THEN SumOfTotalPrice ELSE 0 END)) AS `Over90`
FROM `reconciled`.totalsalesbystoreandtemperature 
GROUP BY storenumber

这是查询的结果：

以下是基础记录集的内容：

Answer 1

您需要将所有CASE WHEN ...部分更改为CASE temperature WHEN temperature BETWEEN 31 AND 40 THEN ，如下所示：

CASE WHEN temperature BETWEEN 31 AND 40 THEN

更改为

CASE

当前，temperature试图将WHEN列与false语句中给出的逻辑测试结果进行比较。由于这些类型不同，因此您不断得到0和{{1}}的结果。