不同条件下的多重选择计数

Question

我有一个包含clients_status的表，并且我的查询如下：

SELECT ROUND((SUM(client_status='BAD DEBT')/COUNT(*))*100) AS BAD, 
       ROUND((SUM(client_status='ALERT')/COUNT(*))*100) AS ALERT, 
       ROUND((SUM(client_status='REMIND BAYAR')/COUNT(*))*100) AS REMIND, 
       ROUND((SUM(client_status='RUTIN BAYAR')/COUNT(*))*100) AS RUTIN, 
       ROUND((SUM(client_status='POTENSI KOREKSI')/COUNT(*))*100) AS POTENSI, 
       ROUND((SUM(client_status='TOP 10')/COUNT(*))*100) AS TOP FROM clients

查询的输出如下：

我应该怎么做才能使输出像这样：

Data     value
=============== 
Bad      29
Alert    29
Remind   14
Rutin    14
Potensi  0
Top      15

请帮助大家...谢谢

Answer 1

按状态汇总分组，然后交叉联接子查询以获取总计数以计算百分比。对于重命名和自定义顺序，您可以使用CASE s。

SELECT cs.s data,
       cs.c / ca.c * 100 value
       FROM (SELECT CASE client_status
                      WHEN 'BAD DEPT' THEN
                        1
                      WHEN 'ALERT' THEN
                        2
                      WHEN 'REMIND BAYAR' THEN
                        2
                      WHEN 'RUTIN BAYAR' THEN
                        4
                      WHEN 'POTENSI KOREKSI' THEN
                        5
                      WHEN 'TOP 10' THEN
                        6
                    END o,
                    CASE client_status
                      WHEN 'BAD DEPT' THEN
                        'Bad'
                      WHEN 'ALERT' THEN
                        'Alert'
                      WHEN 'REMIND BAYAR' THEN
                        'Remind'
                      WHEN 'RUTIN BAYAR' THEN
                        'Rutin'
                      WHEN 'POTENSI KOREKSI' THEN
                        'Potensi'
                      WHEN 'TOP 10' THEN
                        'Top'
                   END s,
                   count(*) c
                   FROM clients
                   GROUP BY client_status) cs
            CROSS JOIN (SELECT count(*) c
                               FROM clients) ca
       ORDER BY cs.o;