Как я могу увеличить временную сложность этого алгоритма в SQL Server - PullRequest
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Как я могу увеличить временную сложность этого алгоритма в SQL Server

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/ 10 ноября 2019

Я пытаюсь сгенерировать комбинации каждой возможной команды, соответствующие правилам лиги. У меня есть два разных метода, к которым я подошел. Один из них - сделать все за один выбор.
Имейте в виду, что, вероятно, около 16 фунтов 32 фунта стерлингов 104 wrs 32 те 16 dst 16 k, а затем 168 fx. Через 10 часов я сгенерировал миллионы предметов, но он все еще не прошел полностью. 

SELECT 
        QB.name, RB1.name, RB2.name, WR1.name, WR2.name, WR3.name, TE.name, FX.name, K.name, DST.name, 
        (QB.salary + RB1.salary + RB2.salary + WR1.salary + WR2.salary + WR3.salary + TE.salary + FX.salary + K.salary + DST.salary) AS cost,
        (QB.projectedFloor + RB1.projectedFloor + RB2.projectedFloor + WR1.projectedFloor + WR2.projectedFloor + WR3.projectedFloor + TE.projectedFloor + FX.projectedFloor + K.projectedFloor + DST.projectedFloor) AS lowest, 
        (QB.projectedCeiling + RB1.projectedCeiling + RB2.projectedCeiling + WR1.projectedCeiling + WR2.projectedCeiling + WR3.projectedCeiling + TE.projectedCeiling + FX.projectedCeiling + K.projectedCeiling + DST.projectedCeiling) AS highest, 
        (QB.projectedPoints + RB1.projectedPoints + RB2.projectedPoints + WR1.projectedPoints + WR2.projectedPoints + WR3.projectedPoints + TE.projectedPoints + FX.projectedPoints + K.projectedPoints + DST.projectedPoints) AS projection
    FROM quarterbacks QB
    INNER JOIN defense DST
    ON DST.defenseId = DST.defenseId
    INNER JOIN kicker K
    ON K.kickerId = K.kickerId
    INNER JOIN tightends TE
    ON  TE.playersId = TE.playersId
    INNER JOIN runningbacks RB1
    ON RB1.playersId = RB1.playersId
    INNER JOIN runningbacks RB2
    ON  RB2.playersId = RB2.playersId
    INNER JOIN receivers WR1
    ON   WR1.playersId = WR1.playersId
    INNER JOIN receivers WR2 
    ON  WR2.playersId = WR2.playersId
    INNER JOIN receivers WR3
    ON   WR3.playersId = WR3.playersId
    INNER JOIN flex FX
    ON  FX.playersId = FX.playersId
    WHERE 
        RB1.runningbacksId != RB2.runningbacksId AND 
        WR1.receiversId != WR2.receiversId AND 
        WR1.receiversId != WR3.receiversId AND 
        WR2.receiversId != WR3.receiversId AND
        FX.playersId != RB1.playersId AND 
        FX.playersId != RB2.playersId AND
        FX.playersId != WR1.playersId AND
        FX.playersId != WR2.playersId AND
        FX.playersId != WR3.playersId AND
        FX.playersId != TE.playersId AND
        (QB.salary + RB1.salary + RB2.salary + WR1.salary + WR2.salary + WR3.salary + TE.salary + K.salary + DST.salary) < 50000 AND
        (QB.salary + RB1.salary + RB2.salary + WR1.salary + WR2.salary + WR3.salary + TE.salary + K.salary + DST.salary) > 45000 
        AND 
        (QB.projectedPoints + RB1.projectedPoints + RB2.projectedPoints + WR1.projectedPoints + WR2.projectedPoints + WR3.projectedPoints + TE.projectedPoints + FX.projectedPoints + K.projectedPoints + DST.projectedPoints) > 100
    ORDER BY
        (QB.projectedCeiling + RB1.projectedCeiling + RB2.projectedCeiling + WR1.projectedCeiling + WR2.projectedCeiling + WR3.projectedCeiling + TE.projectedCeiling + FX.projectedCeiling + K.projectedCeiling + DST.projectedCeiling), 
        (QB.projectedPoints + RB1.projectedPoints + RB2.projectedPoints + WR1.projectedPoints + WR2.projectedPoints + WR3.projectedPoints + TE.projectedPoints + FX.projectedPoints + K.projectedPoints + DST.projectedPoints),
        (QB.projectedFloor + RB1.projectedFloor + RB2.projectedFloor + WR1.projectedFloor + WR2.projectedFloor + WR3.projectedFloor + TE.projectedFloor + FX.projectedFloor + K.projectedFloor + DST.projectedFloor)

У меня также есть другой подход, в котором я не совсем понимаю, будет ли он быстрее. Это включает в себя создание небольших таблиц, а затем их объединение. 

DECLARE @QBSRBS TABLE (
    qb nvarchar(max),
    rb1 nvarchar (max),
    rb2 nvarchar (max),
    cost int,
    highest float,
    lowest float,
    points float
); 

DECLARE @WRS TABLE (
    wr1 nvarchar(max),
    wr2 nvarchar(max),
    wr3 nvarchar(max),
    cost int,
    highest float,
    lowest float,
    points float
);

DECLARE @TEsDSTK TABLE (
    te nvarchar(max),
    fx nvarchar(max),
    dst nvarchar(max),
    k nvarchar(max),
    cost int,
    highest float,
    lowest float,
    points float
);

INSERT INTO @QBSRBS
    SELECT
        QB.name, RB1.name, RB2.name,
        (QB.salary + RB1.salary + RB2.salary ) AS cost,
        (QB.projectedFloor + RB1.projectedFloor + RB2.projectedFloor) AS lowest, 
        (QB.projectedCeiling + RB1.projectedCeiling + RB2.projectedCeiling) AS highest, 
        (QB.projectedPoints + RB1.projectedPoints + RB2.projectedPoints) AS projection
    FROM quarterbacks QB
        INNER JOIN runningbacks RB1
    ON RB1.playersId = RB1.playersId
        INNER JOIN runningbacks RB2
    ON  RB2.playersId = RB2.playersId
    WHERE 
        RB1.runningbacksId != RB2.runningbacksId AND
        RB1.team != RB2.team

INSERT INTO @WRS
    SELECT
        WR1.name, WR2.name, WR3.name,
        (WR1.salary + WR2.salary + WR3.salary) AS cost,
        (WR1.projectedFloor + WR2.projectedFloor + WR3.projectedFloor) AS lowest, 
        (WR1.projectedCeiling + WR2.projectedCeiling + WR3.projectedCeiling) AS highest, 
        (WR1.projectedPoints + WR2.projectedPoints + WR3.projectedPoints) AS projection
    FROM receivers WR1
        INNER JOIN receivers WR2 
    ON  WR2.playersId = WR2.playersId
        INNER JOIN receivers WR3
    ON   WR3.playersId = WR3.playersId
    WHERE WR1.receiversId != WR2.receiversId AND 
        WR1.receiversId != WR3.receiversId AND 
        WR2.receiversId != WR3.receiversId AND
        WR1.team != WR2.team AND WR1.team != WR3.team AND
        WR2.team != WR3.team

INSERT INTO @TEsDSTK 
    SELECT TE.name, FX.name, K.name, DST.name, 
        (TE.salary + FX.salary + K.salary + DST.salary) AS cost,
        (TE.projectedFloor + FX.projectedFloor + K.projectedFloor + DST.projectedFloor) AS lowest, 
        (TE.projectedCeiling + FX.projectedCeiling + K.projectedCeiling + DST.projectedCeiling) AS highest, 
        (TE.projectedPoints + FX.projectedPoints + K.projectedPoints + DST.projectedPoints) AS projection
    FROM kicker K
        INNER JOIN tightends TE
    ON  TE.playersId = TE.playersId
        INNER JOIN flex FX
    ON  FX.playersId = FX.playersId
        INNER JOIN defense DST
    ON DST.defenseId = DST.defenseId
    WHERE TE.playersId != FX.playersId

SELECT 
    qb, rb1, rb2, wr1, wr2, wr3, te, fx, k, dst, 
    (QR.cost + WR.cost + TFDK.cost) as cost,
    (QR.lowest + WR.lowest + TFDK.lowest ) as lowest,
    (QR.highest + WR.highest + TFDK.highest) as highest,
    (QR.points + WR.points + TFDK.points) as points
FROM @QBSRBS QR
    INNER JOIN @TEsDSTK TFDK
ON TFDK.cost = TFDK.cost
    INNER JOIN @WRS WR
ON WR.cost = WR.cost 
WHERE 
    QR.rb1 != TFDK.fx AND
    QR.rb2 != TFDK.fx AND 
    WR.wr1 != TFDK.fx AND
    WR.wr2 != TFDK.fx AND
    WR.wr3 != TFDK.fx AND
    (QR.highest + WR.highest + TFDK.highest) > 203

Как я могу повысить эффективность этого?

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