TSQL與GROUP BY計數和排名

Question

比方說，我有以下幾點：

DECLARE @Name TABLE (Name VARCHAR(MAX)); 

INSERT INTO @Name VALUES ('bob'),('bob'),('john'),('john'),('mark'),('mark'),('mark'),('lisa'); 

SELECT Name, 
COUNT(Name) AS TOTALS 
FROM @Name 
GROUP BY Name 
ORDER BY TOTALS DESC; 

如何我也用RANK（）或DENSE_RANK（），以獲得基於計數的排名？

Answer 1

如果你想要一個排名列，您可以用group by使用它：

SELECT n.Name, COUNT(*) as TOTALS, 
     RANK() OVER (ORDER BY COUNT(*) DESC) as Total_Rank 
FROM @Name n 
GROUP BY n.Name 
ORDER BY TOTALS DESC; 

Answer 2

試試這個：

SELECT * 
    , RANK() OVER(ORDER BY totals DESC) AS Rank 
FROM 
(
    SELECT Name, 
    COUNT(Name) AS TOTALS 
    FROM @Name 
    GROUP BY Name 
) a