具有按计数和等级分组的TSQL

Question

假设我有以下几点：

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;

我还如何使用Rank（）或Dense_Rank（）来基于计数获得排名？

Answer 1

如果需要排名列，可以将其与group by一起使用：

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

尝试这个：

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