COUNT OVER PARTITION SQL Server中的COUNT

Question

SELECT MobilePhone, COUNT(MobilePhone) OVER(PARTITION BY MobilePhone) AS CountMobilePhone
FROM ES_TABLE 
WHERE applic IN ( SELECT appl 
                FROM Campaign JOIN Client ON Campaign.ClientID = Client.ClientID 
                WHERE Client.ClientCode = 'OPIS')

這就是我的疑問

輸出是

MobilePhone  | CountMobilePhone
121928       |    1
912819       |    1
129819       |    3
198219       |    5
918298       |    5

我想通過CountMobilePhone進行分組計數。 就像這樣

Count   | CountMobilePhone
2       |    1
1       |    3
2       |    5

那可能嗎？ 我已經嘗試了幾次但是收到錯誤

Answer 1

只需對計數本身進行另一次聚合：

SELECT CountMobilePhone, COUNT(*) AS cnt
FROM
(
    SELECT COUNT(MobilePhone) OVER(PARTITION BY MobilePhone) AS CountMobilePhone
    FROM ES_TABLE 
    WHERE applic IN (SELECT appl FROM Campaign INNER JOIN Client
                         ON Campaign.ClientID = Client.ClientID 
                     WHERE Client.ClientCode = 'OPIS')
) t
GROUP BY CountMobilePhone
ORDER BY CountMobilePhone;

Answer 2

試試這個

WITH CTE
AS
(

SELECT 
    MobilePhone, 
    COUNT(MobilePhone) OVER(PARTITION BY MobilePhone) AS CountMobilePhone
    FROM ES_TABLE 
    WHERE EXISTS  ( SELECT  1
                    FROM Campaign JOIN Client ON Campaign.ClientID = Client.ClientID 
                    WHERE Client.ClientCode = 'OPIS' AND appl = ES_TABLE.applic)

)
SELECT
    [Count] = COUNT(1),
    CountMobilePhone
    FROM CTE
        GROUP BY CountMobilePhone

我還用存在替換了IN以獲得更好的性能