没有子查询的sql server最大值计数

Question

我想编写一个 T-SQL 查询，它不仅返回最大值，而且返回具有最大值的行数。一定有比我想出的更好的方法

 --wrong way 
 select LibraryBranchId, max(daysCheckedOut), count(daysCheckedOut) 
 from books group by LibraryBranchId

 LibraryBranchId   Expr1      Expr2
 ----------------------------------
 1                 100       398503  (WRONG!)
 2                 75         94303  (WRONG!)
 3                 120       103950  (WRONG!)

我可以通过 INNER JOINing 一个子查询来正确地做到这一点，但这似乎很浪费

 --right way, but seems WAY too long
 select LibraryBranchId,max(daysCheckedOut),count(daysCheckedOut)
 from books inner join 
   ( select LibraryBranchId, max(daysCheckedOut) as maxDaysCheckedOut
     from books group by LibraryBranchId ) as maxbooks 
 on books.LibraryBranchId=maxbooks.LibraryBranchId
 where daysCheckedOut=maxDaysCheckedOut
 group by LibraryBranchId 

 LibraryBranchId   Expr1      Expr2
 ----------------------------------
 1                 100           17  (RIGHT!)
 2                 75            11  (RIGHT!)
 3                 120            2  (RIGHT!)

那么有没有一种方法像查询 #1 一样简单，但返回查询 #2 中的正确结果？

微软 SQL Server 2000

编辑:我第一次尝试输入时错过了上面两个重要的 GROUP BY，我已经添加了它们
编辑:假装 Cade Roux 写的版本是我写的

Answer 1

我认为是对的:

SELECT maxbooks.LibraryBranchId, maxbooks.maxDaysCheckedOut, count(*)
FROM books
INNER JOIN (
    SELECT LibraryBranchId, max(daysCheckedOut) AS maxDaysCheckedOut
    FROM books
    GROUP BY LibraryBranchId
) AS maxbooks
    ON books.LibraryBranchId = maxbooks.LibraryBranchId
    AND books.daysCheckedOut = maxbooks.maxDaysCheckedOut
GROUP BY maxbooks.LibraryBranchId, maxbooks.maxDaysCheckedOut

我认为没有更简单的方法 - 从概念上讲，它是两个集合的交集。关于分支的元组集和满足它的元组集。