Question

表的结构：

ID | firm | city | province

1  | test1 | Warszawa | 1
2  | test2 | Gdańsk   | 12
3  | test3 | Otwock   | 1
3  | test4 | Kraków   | 3
4  | test5 | Olkusz   | 3

这是我的SQL查询：

    SELECT COUNT(miasto) AS cntcity, wojewodztwo, miasto FROM tabela GROUP BY wojewodztwo, miasto ORDER BY wojewodztwo

结果是：

cnt_city | province   | city
6           1           Warszawa
2           1           Otwock
3           5           Kraków
7           5           Olkusz
3           12          Gdańsk

我想要数＆＃34; cnt_city＆＃34;太，或者更确切地说是SUM＆＃34; cnt_city＆＃34; - 6 + 2 = 8,3 + 7 = 10,3我知道如何在PHP中执行此操作，但是可以在SQL中执行此操作吗？如何修改上面的SQL查询？我想要这样的结果：

cnt_city | province | city      | cnt_firm
6          1           Warszawa | 8
2          1           Otwock   | 8
3          5           Kraków   | 10
7          5           Olkusz   | 10
3          12          Gdańsk   | 3

Answer 1

使用Window Function

SELECT cntcity,
       province,
       city,
       Sum(cntcity)OVER(partition BY province) As cnt_firm
FROM   (SELECT Count(miasto) AS cntcity,
               province,
               city          to
        FROM   tabela
        GROUP  BY wojewodztwo,
                  miasto) a

获取正确的数据 - 城市和省份数量

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