将总和转换为百分比

Question

我想将总和结果转换为百分比。添加后，总计100％。我已经通过备注对其进行分组，并且已经从我的查询中得到了总数。但它仍然在数量上。

这是我的查询

SELECT
    CASE
        WHEN A.district = B.district THEN 'Delivered from store in same district'
        WHEN A.city = B.city THEN 'Delivered from store in same city'
        WHEN A.province = B.province THEN 'Delivered from store in same province'
        ELSE 'Not delivered from nearest store'
    END AS 'REMARK',
    SUM(CASE
        WHEN YEAR(T1.create_time) = '2019' AND MONTH(T1.create_time) = '01' THEN 1
        ELSE 0
    END) AS 'Jan-19',
    SUM(CASE
        WHEN YEAR(T1.create_time) = '2019' AND MONTH(T1.create_time) = '02' THEN 1
        ELSE 0
    END) AS 'Feb-19',
    SUM(CASE
        WHEN YEAR(T1.create_time) = '2019' AND MONTH(T1.create_time) = '03' THEN 1
        ELSE 0
    END) AS 'Mar-19', 
    SUM(CASE
        WHEN YEAR(T1.create_time) = '2019' AND MONTH(T1.create_time) = '04' THEN 1
        ELSE 0
    END) AS 'Apr-19'
FROM 
    au_store_add A
INNER JOIN
    (SELECT
        A.id,
        A.code,
        A.create_time,
        A.plat_create_time,
        A.appoint_stcode,
        A.status
        FROM deli_order A
        WHERE A.appoint_stcode IS NOT NULL
    UNION
        SELECT
        B.id,
        B.code,
        B.create_time,
        B.plat_create_time,
        B.destination_code,
        B.status
        FROM deli_order B
        WHERE B.destination_code IS NOT NULL) T1 ON T1.appoint_stcode = A.store_code
INNER JOIN
    deli_order_delivery B ON B.order_id = T1.id
WHERE 
    YEAR(T1.plat_create_time)='2019' and T1.status = 6 and (month(T1.plat_create_time) in (1,2,3,4))
GROUP BY
    CASE
        WHEN A.district = B.district THEN 'Delivered from store in same district'
        WHEN A.city = B.city THEN 'Delivered from store in same city'
        WHEN A.province = B.province THEN 'Delivered from store in same province'
        ELSE 'Not delivered from nearest store'
    END

结果是这样的

REMARK                                | Jan-19| Feb-19| Mar-19| Apr-19|
-----------------------------------------------------------------------
Delivered from store in same city        252      198    308      283
Delivered from store in same district    114      110    163      138 
Delivered from store in same province    1135     976    1387    1208
Not delivered from nearest store         3046     2518   3189    3123

我需要每个月生成这样的东西（没有'总计'）

REMARK                                | Jan-19| 
-----------------------------------------------
Delivered from store in same city        5.5%     
Delivered from store in same district    2.5%     
Delivered from store in same province    25%     
Not delivered from nearest store         67%    
Grand Total                              4547  (100%)   

我应该在查询中添加什么？

Answer 1

鉴于您使用的是MySQL 8+，那么COUNT()作为分析函数应该可以使用。它在这里派上用场：

SELECT
    CASE
        WHEN A.district = B.district THEN 'Delivered from store in same district'
        WHEN A.city = B.city THEN 'Delivered from store in same city'
        WHEN A.province = B.province THEN 'Delivered from store in same province'
        ELSE 'Not delivered from nearest store'
    END AS REMARK,
    100.0 * COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-01' THEN 1 END)
        / COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-01'
                     THEN 1 END) OVER () `Jan-19`,
    100.0 * COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-02' THEN 1 END)
        / COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-02'
                     THEN 1 END) OVER () `Feb-19`,
    100.0 * COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-03' THEN 1 END)
        / COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-03'
                     THEN 1 END) OVER () `Mar-19`,
    100.0 * COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-04' THEN 1 END)
        / COUNT(CASE WHEN DATE_FORMAT(create_time, '%Y-%m') = '2019-04'
                     THEN 1 END) OVER () `Apr-19`
FROM 
    au_store_add A
...

我使用上面的DATE_FORMAT来检查年份和月份的详细程度。我还用COUNT代替SUM，这让我们可以使用稍短的条件表达式。