有没有办法使用 IN 并计算 T-SQL 中从左到右的值？

Question

简化示例：

select top(1) team.points
from teams
where team.ID = '123' and team.season IN ('2021', '2015', '2010')

我一直在搜索，但找不到可靠的答案。我想使用 IN 子句来获取某些行，但我希望它从左到右工作。

在上面的例子中，我想要一行 2021 年，然后是 2015 年，然后是 2010 年（假设没有季节为空）。

有没有办法让 IN 子句关心顺序？

编辑：所以根据评论，我可以看出我的例子不好。我对其进行了编辑，希望能说明问题所在。我正在寻找一个结果，但我需要检查 IN 子句 IN ORDER 中的值，而我字段中的实际数据不是数字或容易排序的。在评论中建议在 order by 子句中使用 case 语句来使该字段可以被排序。我不知道您可以在 order by 子句中使用 case 语句。这似乎解决了我的问题。

Answer 1

由于没有数据可以测试，我不确定结果

试试这个：

DECLARE     @YearList   TABLE   (ID int IDENTITY(1,1), Year int)
                            --  insert them in the desired order from left to right.
INSERT INTO @YearList   VALUES ('2021'), ('2015'), ('2010'); 

SELECT 
        T.points
FROM    teams       T
JOIN    @YearList   Y   ON  Y.Year = T.season
WHERE   T.ID = '123'
ORDER BY    Y.ID

Answer 2

以下代码演示了几种过滤和排序数据的方法。 Any 可以修改为 return 只是 top (1) Points，但为了清楚起见，显示了完整的输出。

-- Sample data.
declare @Teams as Table ( Id VarChar(4), Season VarChar(4), Points VarChar(4) );

insert into @Teams ( Id, Season, Points ) values
  ( '1', '2010', 'VC' ), ( '12', '2010', 'CX' ), ( '123', '2010', 'XI' ),
  ( '1', '2015', 'VCI' ), ( '12', '2015', 'CXI' ), ( '123', '2015', 'XII' ),
  ( '1', '2021', 'VCII' ), ( '12', '2021', 'CXII' ), ( '123', '2021', 'XIII' );

select * from @Teams;

-- OP's original query without any explicit order.
select Id, Season, Points
  from @Teams
  where Id = '123' and Season in ( '2021', '2015', '2010' );

-- With order imposed by a   case   expression.
--   For each   Season   the   case   expression needs to be extended to supply an  appropriate value.
select Id, Season, Points
  from @Teams
  where Id = '123' and Season in ( '2021', '2015', '2010' )
  order by case Season
    when '2021' then 1
    when '2015' then 2
    when '2010' then 3
    else 42 end; -- Put unexpected values last.

-- With order and filtering by a   values   clause (equivalent to a separate table).
--   For each   Season   there needs to be an additional row in   Seasons   to specify both the
--     season and its order.  This has the benefit of keeping the pairs of values together.
select T.Id, T.Season, T.Points
  from @Teams as T inner join
    ( values ( '2021', 1 ), ( '2015', 2 ), ( '2010', 3 ) )
    as Seasons( Season, SeasonOrder ) on T.Season = Seasons.Season
  where T.Id = '123'
  order by Seasons.SeasonOrder;

有没有办法使用 IN 并计算 T-SQL 中从左到右的值？

Is there a way to use IN and it evaluate values left to right in T-SQL?

sql

tsql

sql-server