如何使用GROUP BY來計算區間

Question

請考慮這一形象：

我有這樣的一個表：

Age    Active   Men/Women 
------------------------------------------------- 

我想寫一個查詢，calulate Count的每年齡間隔爲男性和女性。我不知道我可以如何使用GROUP BY和間隔。

在我的報告在上面的圖像的左側我想計算UnActive rows.How我可以合併這個查詢一個查詢？

感謝

Answer 1

SELECT 
    Active.State, 
    Age.Base, Age.Base+4, 
    COUNT(*) AS TotalCount, 
    COUNT(CASE WHEN T.[Men/Women] = 'man' THEN 1 END) AS ManCount, 
    COUNT(CASE WHEN T.[Men/Women] = 'woman' THEN 1 END) AS WomanCount 
FROM 
    (
    VALUES (10),(15),(20),(25),(30),(35),(40) /*.. add the rest */,(90),(95) 
    ) AS Age(base) 
    CROSS JOIN 
    (
    VALUES (0), (1) 
    ) AS Active(State) 
    LEFT JOIN 
    MyTable T ON T.Age BETWEEN Age.Base AND Age.Base+4 AND T.Active = Active.State 
GROUP BY 
    Active.State, 
    Age.Base, Age.Base+4; 

在此之後，你可以格式化你想怎麼

編輯生成空範圍

Answer 2

可以GROUP BY年齡區間的情況：

SELECT 
    COUNT(*) AGE_COUNT, 
    CASE WHEN AGE BETWEEN 15 AND 19 THEN 'Age 15-19' 
     WHEN AGE BETWEEN 20 AND 24 THEN 'Age 20-24' 
     ELSE 'Other' 
    END AGE_INTERVAL 
FROM 
    YOUR_TABLE 
GROUP BY 
    CASE WHEN AGE BETWEEN 15 AND 19 THEN 'Age 15-19' 
     WHEN AGE BETWEEN 20 AND 24 THEN 'Age 20-24' 
     ELSE 'Other' 
    END  

Answer 3

這應該工作：

SELECT SUM(CASE WHEN [Men/Women] = 'M' THEN 1 ELSE 0 END) AS Men, 
SUM(CASE WHEN [Men/Women] = 'W' THEN 1 ELSE 0 END) AS Women, 
COUNT(*) as Total, 
CASE WHEN Age BETWEEN 10 AND 14 THEN 'Age 10-14' 
    WHEN Age BETWEEN 15 AND 19 THEN 'Age 15-19' 
    WHEN Age BETWEEN 20 AND 24 THEN 'Age 20-24' 
    ELSE 'Old' 
END Age 
FROM MyTable 
WHERE Active = 1 
GROUP BY  CASE WHEN Age BETWEEN 10 AND 14 THEN 'Age 10-14' 
    WHEN Age BETWEEN 15 AND 19 THEN 'Age 15-19' 
    WHEN Age BETWEEN 20 AND 24 THEN 'Age 20-24' 
    ELSE 'Old' 
END 

Answer 4

實際上，你可以從擴大安德烈什麼...提供

SELECT 
    CASE WHEN YT.AGE BETWEEN 15 AND 19 THEN 'Age 15-19' 
     WHEN YT.AGE BETWEEN 20 AND 24 THEN 'Age 20-24' 
     ELSE 'Other' 
    END AGE_INTERVAL, 
    SUM(CASE WHEN YT.Active THEN 1 ELSE 0 END) as ActiveCount, 
    SUM(CASE WHEN YT.Gender = 'M' THEN 1 ELSE 0 END) as MaleCount, 
    SUM(CASE WHEN YT.Gender = 'F' THEN 1 ELSE 0 END) as FemaleCount, 
    COUNT(*) AgeGroupCount 
FROM 
    YourTable YT 
GROUP BY 
    Age_Interval 

Answer 5

正如其他人所說，這是試圖在一個方式，是不一樣的你的數據在所有的報告。

但我認爲最好的方式實現這一目標SQL中是創建一個標量函數（道具@gbn的最小/最大年齡範圍邏輯）：

CREATE FUNCTION usvf_calculate_age_bracket 
(
    -- Add the parameters for the function here 
    @age INT 
) 
RETURNS VARCHAR(50) 
AS 
BEGIN 
    -- Return the result of the function 
    RETURN CAST(@age/5*5 AS VARCHAR(20)) + '-' + CAST(@age/5*5+4 AS VARCHAR(20)) 
END 
GO 

然後在你的查詢，你可以這樣做：

SELECT SUM(CASE WHEN gender = 'F' THEN active ELSE 0 END) AS [Women], 
    SUM(CASE WHEN gender = 'M' THEN active ELSE 0 END) AS [Men], 
    SUM(CAST(active AS int)) AS [Total], 
    'Age ' + dbo.usvf_calculate_age_bracket(age) AS [Age] 
FROM myTable 
GROUP BY dbo.usvf_calculate_age_bracket(age) 

我的測試代碼：

DECLARE @T TABLE 
(
age int, 
active bit, 
gender char(1) 

) 

INSERT INTO @T VALUES (25, 1, 'M'),(32, 0, 'F'),(21, 1, 'M'),(22, 1, 'F'),(28, 1, 'F'),(32, 0, 'M'), (23, 1, 'M'),(42, 0, 'F'),(29, 1, 'M'),(29, 1, 'F'),(28, 1, 'F'),(32, 1, 'M') 

SELECT SUM(CASE WHEN gender = 'F' THEN active ELSE 0 END) AS [Women], 
SUM(CASE WHEN gender = 'M' THEN active ELSE 0 END) AS [Men], 
SUM(CAST(active AS int)) AS [Total], 
'Age ' + dbo.usvf_calculate_age_bracket(age) AS [Age] FROM @T 
GROUP BY dbo.usvf_calculate_age_bracket(age) 

結果：

Women Men Total Age 
1 2 3  Age 20-24 
3 2 5  Age 25-29 
0 1 1  Age 30-34 
0 0 0  Age 40-44 

這似乎接近你想要的，它並不是一個過分複雜的SQL查詢來實現這一點。 （除了我不能計算出你的'總'列）