Question

SQL Server：

给定的表有一列带有ID，一列带有整数值，一列带有值给ID的日期和时间。因此，一个ID可以有多个相应的值。

示例：

id  Value  datetime     
---|-----|------------------------
1  | 10  | 04/03/2009 10:12:33.000
2  | 13  | 05/02/2009 11:02:03.000
1  | 20  | 10/10/2009 13:22:45.000
1  | 15  | 12/03/2010 15:12:33.000
2  | 19  | 25/05/2009 10:12:33.000
2  | 17  | 09/06/2009 17:18:45.000

如果为ID找到值20，则忽略具有相同ID的每个其他行。否则显示id的最后一个值。

结果：

id  Value  datetime     
---|-----|------------------------
2  | 17  | 09/06/2009 17:18:45.000

Answer 1

希望您使用NOT IN或LEFT JOIN来过滤条件。

您可以尝试以下查询：

SELECT TOP 1 *
FROM YourTable WHERE Id NOT IN (
SELECT Id FROM YourTable WHERE Value = 20)
ORDER BY Value DESC

使用数据执行示例：

DECLARE @YourTable TABLE (id INT,  Value INT, datetime   DATETIME)
INSERT INTO @YourTable (id, Value, datetime)
SELECT 1 , 10 , '2009-03-04 10:12:33.000' UNION
SELECT 2 , 13 , '2009-02-05 11:02:03.000' UNION
SELECT 1 , 20 , '2009-10-10 13:22:45.000' UNION
SELECT 1 , 15 , '2010-03-12 15:12:33.000' UNION
SELECT 2 , 19 , '2009-05-25 10:12:33.000' UNION
SELECT 2 , 17 , '2009-06-09 17:18:45.000' 

SELECT TOP 1 *
FROM @YourTable WHERE Id NOT IN (
SELECT Id FROM @YourTable WHERE Value = 20)
ORDER BY Value DESC

Answer 2

按ID分组使用ROW_NUMBER和PARTITION，并按日期时间以desc顺序选择最后一次输入值。

    select id, value, datetime from (
         select ROW_NUMBER() over(PARTITION by id Order by id,datetime desc) as row_rank, id, value, datetime
         from tbl_1
    ) as A
    where row_rank=1

Answer 3

使用NOT EXISTS过滤掉，并使用ROW_NUMBER排名：

DECLARE @t TABLE ( id INT, v INT, d DATETIME )
INSERT  INTO @t
VALUES  ( 1, 10, '2009-03-04 10:12:33.000' ),
        ( 2, 13, '2009-02-05 11:02:03.000' ),
        ( 1, 20, '2009-10-10 13:22:45.000' ),
        ( 1, 15, '2010-03-12 15:12:33.000' ),
        ( 2, 19, '2009-05-25 10:12:33.000' ),
        ( 2, 17, '2009-06-09 17:18:45.000' );


WITH    cte
          AS ( SELECT   * ,
                        ROW_NUMBER() OVER ( PARTITION BY id ORDER BY d DESC ) AS rn
               FROM     @t t
               WHERE    NOT EXISTS ( SELECT *
                                     FROM   @t
                                     WHERE  id = t.id
                                            AND v = 20 )
             )
    SELECT  *
    FROM    cte
    WHERE   rn = 1

Answer 4

SELECT Top 1 * 
FROM @YourTable 
Group by id, Value, datetime 
Having Value<20 
ORDER BY Value DESC

SQL：如果找到某个值，则忽略为ID指定的所有其他值

4 个答案: