您可以使用 CASE WHEN THEN 别名进行 GROUP BY 吗?
我有一个 SELECT 语句是根据 CASE WHEN THEN 状态(或可以使用多个 IF 语句)计算的,别名为长度",我需要正确地将结果分组在一起.SELECT 似乎正在工作,但该组将它们分组错误.这是我的声明:
I have a SELECT statement being calculated from a CASE WHEN THEN state (or could use multiple IF statements) aliased as 'Length', and I need to correctly GROUP the results together. The SELECT seems to be working, but the group groups them wrong. Here is my statement:
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;
这将所有结果分为3 - 4 个月",这是不正确的..
This groups all results into '3 - 4 Months' which isn't right..
推荐答案
GROUP BY
子句中的 CASE
语句如果不换行,则需要使用整个语句它在子查询中.
You need to use the whole CASE
statement in the GROUP BY
clause if you don't wrapped it in a subquery.
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
ON person.EntityID = o.id
INNER JOIN Organization AS org
ON o.OrganizationID = Org.ID
WHERE person.TitleID = 2
AND o.bID = 1
GROUP BY 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
ORDER BY Length ASC;
同时删除 ORDER BY
子句中列名周围的单引号.
Remove also the single quotes around the column name in the ORDER BY
clause.
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