用查找表替换硬编码值

Question

我想在我的 case 语句中使用查找表而不是使用硬编码值来确定设置边界。我没有做过任何类型的查找表，所以只是想要指导如何编写以下代码。

我有一个名为“ScoreReference”的表格，它显示以下内容：

如何在我的 CASE 语句中使用此查找表来替换硬编码值？

SELECT
TeamScore,
CASE WHEN TeamScore BETWEEN 11 AND 25  --Home Team Wins by 1 goal
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 1 ORDER BY NEWID())
     WHEN TeamScore BETWEEN 26 AND 40  --Home Team Wins by 2 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 2 ORDER BY NEWID())
     WHEN TeamScore BETWEEN 41 AND 55  --Home Team Wins by 3 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 3 ORDER BY NEWID())
     WHEN TeamScore BETWEEN 56 AND 70  --Home Team Wins by 4 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 4 ORDER BY NEWID())
     WHEN TeamScore > 71  --Home Team Wins by 5 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 5 ORDER BY NEWID())
    WHEN TeamScore BETWEEN -25 AND -11 --Away Team Wins by 1 goal
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -1 ORDER BY NEWID())
    WHEN TeamScore BETWEEN -40 AND -26  --Away Team Wins by 2 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -2 ORDER BY NEWID())
    WHEN TeamScore BETWEEN -55 AND -41  --Away Team Wins by 3 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -3 ORDER BY NEWID())
    WHEN TeamScore BETWEEN -70 AND -56  --Away Team Wins by 4 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -4 ORDER BY NEWID())
    WHEN TeamScore <= -71  --Away Team Wins by 5 goals
        THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -5 ORDER BY NEWID())    
    ELSE (SELECT TOP 1 ScoreID FROM dbo.Score WHERE ScoreDifference = 0 ORDER BY NEWID()) -- Draw
END AS ScoreID

更新：

下面是“分数”表：

正如你所看到的，我想要做的是根据每支球队的权重（一个球队的权重是主队，另一个是客队'），权重的差异会反映在比分上。例如，如果两队之间的权重相差 11 -25，则得分差异为“1”，这意味着从“得分”表中，我们将随机选择差异为“1”的得分。

两个表的日期设置：

分数参考：

CREATE TABLE [dbo].[ScoreReference]
(
    [ScoreReferenceID] TINYINT IDENTITY (1,1) NOT NULL PRIMARY KEY, 
    [HomeWeighting] INT NULL, 
    [AwayWeighting] INT NULL, 
    [ScoreDifference] INT NULL
)

得分：

CREATE TABLE [dbo].[Score]
(
    [ScoreID] INT IDENTITY(1,1) NOT NULL PRIMARY KEY, 
    [HomeScore] INT NULL, 
    [AwayScore] INT NULL,
    [ScoreDifference] INT NULL
)

夹具：

CREATE TABLE [dbo].[Fixture](
    [FixtureID] INT NOT NULL PRIMARY KEY,
    [WeekNumber] TINYINT NOT NULL,
    [FixtureDate] DATE NULL,
    [HomeTeamID] TINYINT NULL,
    [HomeScore] INT NULL,
    [AwayTeamID] TINYINT NULL,
    [AwayScore] INT NULL,
    [HomeTeamResult] CHAR(1) NULL,
    [AwayTeamResult] CHAR(1) NULL,
    [LeagueID] TINYINT CONSTRAINT FK_Fixture_League FOREIGN KEY REFERENCES League(LeagueID)
)

团队加权：

WITH pl AS (SELECT DISTINCT p.PlayerID
                            ,p.Position
                            ,CASE WHEN p.TeamID = 0 THEN 0
                                  ELSE p.playerWeighting END AS playerWeighting
                            ,ABS(CHECKSUM(NewID())) % 10 + 1 AS Form
                            ,t.TeamID
            FROM dbo.Fixture f
            INNER JOIN dbo.League l ON f.LeagueID = l.LeagueID
            INNER JOIN dbo.Team t ON l.LeagueID = t.LeagueID
            INNER JOIN dbo.Player p ON t.TeamID = p.TeamID
            WHERE f.WeekNumber = 1)
,po AS (SELECT *,ROW_NUMBER() OVER(PARTITION BY pl.TeamID, pl.Position ORDER BY NEWID()) AS Rnk FROM pl)
SELECT TeamID
    ,SUM(po.playerWeighting) AS TeamWeight
    ,Form--ABS(CHECKSUM(NewID())) % 10 + 1 AS Form
    ,SUM(po.playerWeighting / 10 * Form + po.playerWeighting) AS FinalTeamWeight
FROM po
WHERE (po.Position = 'GK' and po.rnk = 1) OR 
        (po.Position = 'DF' and po.rnk <= 4) OR
        (po.Position = 'MF' and po.rnk <= 4) OR
        (po.Position = 'FW' and po.rnk <= 2)
        GROUP BY po.TeamID

以下是 TeamScore：

;WITH cte AS
(
    SELECT f.FixtureID,
        ht.FinalTeamWeight - at.FinalTeamWeight AS TeamScore
    FROM dbo.Fixture f
    OUTER APPLY
    (
        SELECT tw.FinalTeamWeight
        FROM dbo.TeamWeighting tw
        WHERE tw.TeamID = f.HomeTeamID
    ) ht --HomeTeam
    OUTER APPLY
    (
        SELECT tw.FinalTeamWeight
        FROM dbo.TeamWeighting tw
        WHERE tw.TeamID = f.AwayTeamID
    ) at --AwayTeam
    WHERE f.HomeScore IS NULL AND f.FixtureDate < GETDATE()
)

最新代码：

;WITH cte AS
(
    SELECT f.FixtureID,
        ht.FinalTeamWeight - at.FinalTeamWeight AS TeamScore
    FROM dbo.Fixture f
    OUTER APPLY
    (
        SELECT tw.FinalTeamWeight
        FROM dbo.TeamWeighting tw
        WHERE tw.TeamID = f.HomeTeamID
    ) ht --HomeTeam
    OUTER APPLY
    (
        SELECT tw.FinalTeamWeight
        FROM dbo.TeamWeighting tw
        WHERE tw.TeamID = f.AwayTeamID
    ) at --AwayTeam
    WHERE f.HomeScore IS NULL AND f.FixtureDate < GETDATE()
)


UPDATE f 
SET f.HomeScore = s.HomeScore,
    f.AwayScore = s.AwayScore
FROM dbo.Fixture f
INNER JOIN 
(
    SELECT FixtureID,
    TeamScore
    ,( SELECT
            CASE
            WHEN c.TeamScore BETWEEN HomeWeighting AND AwayWeighting AND HomeScore > AwayScore  AND s.ScoreDifference = Sr.ScoreDifference
                THEN S.ScoreID  
            WHEN c.TeamScore BETWEEN AwayWeighting AND HomeWeighting AND HomeScore < AwayScore  AND s.ScoreDifference = Sr.ScoreDifference
                THEN S.ScoreID 
            WHEN c.TeamScore BETWEEN HomeWeighting AND AwayWeighting AND HomeScore = AwayScore  AND s.ScoreDifference = Sr.ScoreDifference
                THEN S.ScoreID 
            END  
        --CASE WHEN TeamScore BETWEEN 11 AND 25  --Home Team Wins by 1 goal
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 1 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN 26 AND 40  --Home Team Wins by 2 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 2 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN 41 AND 55  --Home Team Wins by 3 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 3 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN 56 AND 70  --Home Team Wins by 4 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 4 ORDER BY NEWID())
        -- WHEN TeamScore > 71  --Home Team Wins by 5 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore > AwayScore AND ScoreDifference = 5 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN -25 AND -11 --Away Team Wins by 1 goal
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -1 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN -40 AND -26  --Away Team Wins by 2 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -2 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN -55 AND -41  --Away Team Wins by 3 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -3 ORDER BY NEWID())
        -- WHEN TeamScore BETWEEN -70 AND -56  --Away Team Wins by 4 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -4 ORDER BY NEWID())
        -- WHEN TeamScore <= -71  --Away Team Wins by 5 goals
        --  THEN (SELECT TOP 1 ScoreID FROM dbo.Score WHERE HomeScore < AwayScore AND ScoreDifference = -5 ORDER BY NEWID())    
     --   ELSE (SELECT TOP 1 ScoreID FROM dbo.Score WHERE ScoreDifference = 0 ORDER BY NEWID()) -- Draw
    FROM dbo.Score s
    LEFT JOIN dbo.ScoreReference sr
    ON s.sr.ScoreReferenceId = sr.ScoreReferenceId
)
    FROM cte c
 ) AS ScoreResult
    ON f.FixtureID = ScoreResult.FixtureID
--INNER JOIN Score s
--  ON score.ScoreID = s.ScoreID

预期输出：

Answer 1

我不完全确定您要完成什么，但如果您保证每个结果都有一个 ScoreDifference 匹配项，也许下面的内容会有所帮助。

select *
from (
    select *,
        DiffScore = HomeScore - AwayScore
    from Score) s
join ScoreReference sr
    on s.DiffScore = sr.ScoreDifference;

您能否提供一个更具体的示例数据集等？

Answer 2

您可以尝试类似的方法。因为我没有数据，有些表无法检查出来。但是试试这个，稍微调整一下，让我知道。

SELECT 
    c.TeamScore
    ,(  SELECT 
            CASE
            WHEN c.TeamScore BETWEEN HomeWeighting AND AwayWeighting AND HomeScore > AwayScore  AND S.ScoreDifference = SF.ScoreDifference
                THEN S.ScoreID  
            WHEN c.TeamScore BETWEEN AwayWeighting AND HomeWeighting AND HomeScore < AwayScore  AND S.ScoreDifference = SF.ScoreDifference
                THEN S.ScoreID 
            END  
        FROM    dbo.Score S
        LEFT JOIN dbo.ScoreReference  SF
            ON S.SF.ScorereferenceId = SF.ScorereferenceId
        )
FROM    cte c