我有一个 SELECT 语句是从 CASE WHEN THEN 状态(或可以使用多个 IF 语句)计算出来的,别名为“长度”,我需要正确地将结果组合在一起。SELECT 似乎正在工作,但该组将它们分组错误。这是我的声明:
SELECT CASE
WHEN DATEDIFF(o.EndDate, o.StartDate) < 30 THEN '<1 Month'
WHEN DATEDIFF(o.EndDate, o.StartDate) < 90 THEN '1 - 2 Months'
WHEN DATEDIFF(o.EndDate, o.StartDate) < 210 THEN '3 - 4 Months'
ELSE '>4 Months' END AS 'Length',
COUNT(DISTINCT(person.ID)) AS 'COUNT'
FROM person
INNER JOIN opportunity AS o
INNER JOIN Organization AS org
ON person.EntityID = o.id
AND O.OrganizationID = Org.ID
WHERE person.TitleID = 2
AND o.bID = 1
GROUP BY 'Length'
ORDER BY 'Length' ASC;
这将所有结果分组为“3 - 4 个月”,这是不对的..