sql-server - SQL 计数两个日期范围之间的年龄

Question

我正在尝试计算数据库中事件记录从当前日期到可能的过去日期的年龄。 这是可能的输出:

15岁至24岁
12

24岁至30岁
15

30岁及以上
25

并计算年龄

age     count
15        3
16        5
17        1
18        2
19        1
20        0
....     ....

Answer 1

要计算年龄:

;With Ages
AS
(
    SELECT CASE 
            WHEN MONTH(getdate()) > MONTH([YourDate]) THEN DATEDIFF(YEAR, [YourDate], getdate())
            WHEN Month([YourDate]) = MONTH(Getdate()) AND Day([YourDate]) < Day(getdate())
            THEN DATEDIFF(YEAR, [YourDate], getdate()) 
            ELSE DATEDIFF(YEAR, [YourDate], getdate())  - 1 END As Age
    FROM #YourTable
)
SELECT Age, count(*) AS [Count]
FROM Ages
GROUP BY Age

并获取日期范围计数:

;With Ages
AS
(
    SELECT CASE 
            WHEN MONTH(getdate()) > MONTH([YourDate]) THEN DATEDIFF(YEAR, [YourDate], getdate())
            WHEN Month([YourDate]) = MONTH(Getdate()) AND Day([YourDate]) < Day(getdate())
            THEN DATEDIFF(YEAR, [YourDate], getdate()) 
            ELSE DATEDIFF(YEAR, [YourDate], getdate())  - 1 END As Age
    FROM #YourTable
),
AgeCount
AS
(
    SELECT Age, count(*) AS [Count]
    FROM Ages
    GROUP BY Age
)
SELECT  SUM(CASE WHEN Age >= 15 and Age < 24 THEN 1 ELSE 0 END) As [15-24],
        SUM(CASE WHEN AGE >= 25 AND Age < 30 Then 1 ELSE 0 END) As [25-30],
        SUM(CASE WHEN AGE > 30 THEN 1 ELSE 0 END) AS [Over 30]
From AgeCount