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請讓我知道,如果有任何語法錯誤,因爲,按照我的理解,查詢是完美的:有沒有語法錯誤,因爲,按照我的理解,查詢是完美
mysql> SELECT Cust_Id,Plan_Id FROM(SELECT Cust_Id,Plan_Id,ROW_NUMBER() OVER (PARTITION BY Cust_Id ORDER BY cnt DESC) AS RN FROM(SELECT Cust_Id,Plan_Id,COUNT(1) as cnt FROM customer GROUP BY (Cust_Id,Plan_Id))) WHERE RN =1;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use
near '(PARTITION BY Cust_Id ORDER BY cnt DESC) AS RN FROM(SELECT Cust_Id,Plan_Id,COUNT'
at line 1
顯然,你需要與你的DBMS(MySQL的)的討論,因爲它與你不同意你的SQL的完善。總的來說,我懷疑數據庫管理系統是正確的,你的完美主張被誇大了。您使用的是哪個版本的MySQL? –
這是Microsoft SQL SERVER語法不是mysql的。 Mysql沒有row_number()over()構造 –
顯然你的理解是不正確的。你應該努力,因爲理解在大多數時候都很重要。 –