Question

我有这样的CTE：

;WITH Lastdt AS
(
    SELECT database_name, backup_finish_date,
    ROW_NUMBER() OVER (PARTITION BY database_name ORDER BY backup_finish_date, database_name) AS 'RowNumber'
    FROM bckHist
) 
SELECT database_name, backup_finish_date
FROM Lastdt
WHERE RowNumber = '7'

如何从查询中获取最高编号的最后一行（替换硬编码的7）？

Answer 1

我认为这很容易......

;WITH Lastdt AS
(
    SELECT database_name, backup_finish_date,
    ROW_NUMBER() OVER (PARTITION BY database_name ORDER BY backup_finish_date desc, database_name) AS 'RowNumber'
    FROM bckHist
) 
SELECT database_name, backup_finish_date
FROM Lastdt
WHERE RowNumber = '1'

Answer 2

如果你真的只需要最后一行（来自你的查询）那么它甚至更简单（对于给定的情况）：


select database_name, max(backup_finish_date)
from bckHist
group by database_name

Answer 3

试试这个：

;WITH Lastdt AS
(
    SELECT database_name, backup_finish_date,
    ROW_NUMBER() OVER (PARTITION BY database_name ORDER BY backup_finish_date, database_name) AS 'RowNumber'
    FROM bckHist
) 
SELECT TOP 1 
   database_name, backup_finish_date
FROM Lastdt
ORDER BY RowNumber DESC

基本上命令RowNumber降序（最大的第一个），然后只选择第一个。

Answer 4

从bckHist中选择数据库名称，backup_finish_date，其中行号=（从bckHist中选择SELECT MAX（行号））

SQL Server：CTE，如何获取最后一个行号

4 个答案: