sql 根据条件选择最小值或最大值第 2 部分答案

【问题标题】：sql select min or max based on condition part 2sql 根据条件选择最小值或最大值第 2 部分
【发布时间】：2015-10-31 02:29:24
【问题描述】：

这个帖子是另一个帖子sql select min or max based on condition的问题的延续

我正在尝试根据各种条件获得一行。

场景 1 - 如果不存在小时数（setup + processtime > 0），则获取最高行。

场景 2 -如果有几个小时（如本例所示），则在此数字之后显示下一个操作 (oprnum)。（prodroute 中为 60）。

查询需要在 CTE 中工作，因为它是更大查询的一部分。

    CREATE TABLE ProdRoute
    ([ProdId] varchar(10), [OprNum] int, [SetupTime] int, [ProcessTime] numeric)
;

INSERT INTO ProdRoute
    ([ProdId], [OprNum], [SetupTime], [ProcessTime])
VALUES
    ('12M0004893', 12, 0.7700000000000000, 1.2500000000000000),
    ('12M0004893', 12, 0.0000000000000000, 0.0000000000000000),
    ('12M0004893', 40, 0.0800000000000000, 0.4000000000000000),
    ('12M0004893', 50, 0.0400000000000000, 2.8000000000000000),
    ('12M0004893', 50, 0.0000000000000000, 0.0000000000000000),
    ('12M0004893', 60, 0.0000000000000000, 0.6100000000000000),
    ('12M0004893', 60, 0.0000000000000000, 0.0000000000000000),
    ('12M0004893', 70, 0.0000000000000000, 1.2900000000000000),
    ('12M0004893', 70, 0.0000000000000000, 0.0000000000000000),
    ('12M0004893', 75, 0.0000000000000000, 3.8700000000000000),
    ('12M0004893', 75, 0.0000000000000000, 0.0000000000000000),
    ('12M0004893', 80, 0.0000000000000000, 0.5500000000000000),
('12M0003571', 3, 0.8900000000000000, 0.0000000000000000),
    ('12M0003571', 3, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 7, 1.0000000000000000, 0.0000000000000000),
    ('12M0003571', 10, 0.3000000000000000, 0.3000000000000000),
    ('12M0003571', 10, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 20, 0.0700000000000000, 0.1000000000000000),
    ('12M0003571', 20, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 30, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 40, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 50, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 60, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 60, 0.0000000000000000, 0.0000000000000000),
    ('12M0003571', 70, 0.0700000000000000, 0.1500000000000000),
    ('12M0003571', 70, 0.0000000000000000, 0.0000000000000000)
;

CREATE TABLE ProdRouteTran
    ([ProdID] varchar(10), [MaxOpCompleted] int, [Hours] numeric)
;

INSERT INTO ProdRouteTran
    ([ProdID], [MaxOpCompleted], [Hours])
VALUES
    ('12M0004893', 50, 1.7800000000000000),
('12M0003571', 70, 1.2660000000000000)
;

预期输出：

ProdId  OprNum
12M0004893  60

ProdId  OprNum
12M0003571  70

【问题讨论】：

标签： sql sql-server tsql sql-server-2012

【解决方案1】：

根据新数据和提问者对答案的最后评论，这是更新后的查询和小提琴：http://sqlfiddle.com/#!6/87e2f/2

嘿，我发现了一个不起作用的示例... orderID '12M0003381'... 我已将数据添加到您的小提琴中。我希望看到操作 70 为这是最后一次设置或处理时间的操作...谢谢！

select prodid, ISNULL(MAX(weighted_value),MIN(oprnum)) as value from
(           
            select 
                a.prodid,
                a.oprnum,
                ISNULL(LEAD(a.oprnum,1) OVER(Partition by a.prodID  ORDER by a.oprnum asc),a.oprnum)  * 
                MAX(case 
                    when ISNULL([Hours], 0) >= (setupTime + ProcessTime) AND (SetupTime + ProcessTime ) > 0 
                    then 1
                    else NULL
                    end) as weighted_value
            from temp1 a LEFT JOIN temp4 b 
                    ON a.OprNum = b.OPRNUM
                    AND a.ProdID = b.ProdId
            group by a.prodid,a.oprnum
) t
group by prodid

以下查询更改的说明：

对查询所做的唯一更改是使用以下语法处理 weighted_value 的 NULL 值

ISNULL(LEAD(a.oprnum,1) OVER(Partition by a.prodID  ORDER by a.oprnum asc),a.oprnum)

有问题的部分是内部查询，当没有 group by 子句运行时，它会显示在用户添加的边界情况下发生的情况。

（请参见此处的小提琴：http://sqlfiddle.com/#!6/87e2f/3）

如果不处理空值，我们有一个NULL，在group by 子句之后会产生如下结构

（请在此处查看小提琴：http://sqlfiddle.com/#!6/87e2f/5）

正如您在将 prodid : 12M0003381, oprnum:70 的 LEAD 值分组时看到的那样，结果为 NULL 而不是 70（因为分组 70 和 NULL 应该给出 70）。

如果 LEAD 是在分组查询/表上计算的，这是合理的，这实际上就是这里发生的事情。

在这种情况下，LEAD 函数将不会返回分区最后一行的任何数据。这是边界情况，必须使用ISNULL 正确处理。

我假设最后一行的LEAD oprnum 值应该被更正为当前行的oprnum 值。

下面的旧答案：

所以我尝试并发布了小提琴链接 http://sqlfiddle.com/#!6/e965c/1

select prodid, ISNULL(MAX(weighted_value),MIN(oprnum)) as value from 
( 
select 
a.prodid, 
a.oprnum, 
LEAD(a.oprnum,1) OVER(Partition by a.prodID ORDER by a.oprnum asc) * 
MAX(case 
when ISNULL([Hours], 0) >= (setupTime + ProcessTime) AND (SetupTime + ProcessTime ) > 0 
then 1 
else NULL 
end) as weighted_value 
from ProdRoute a LEFT JOIN COMPLETED_OP b 
ON a.OprNum = b.OPRNUM 
AND a.ProdID = b.ProdId 
group by a.prodid,a.oprnum 
) t 
group by prodid

【讨论】：

【解决方案2】：

这不是我写过的最漂亮的东西，但它确实有效。我还用其他数据对它进行了测试。

已修改以满足新要求。

SELECT
    *
FROM
    (
        SELECT
            A.ProdID,
            MIN(A.OprNum) AS 'OprNum'
        FROM
            #ProdRoute AS A
            JOIN 
                (
                    SELECT
                        ProdID,
                        MAX(MaxOpCompleted) AS 'OprNum'
                    FROM
                        #ProdRouteTran
                    GROUP BY
                        ProdID
                ) AS B
                ON A.ProdId = B.ProdId AND A.OprNum > B.OprNum
        GROUP BY
            A.ProdID
    ) AS [HoursA]
UNION ALL
SELECT
    *
FROM
    (
        SELECT
            DISTINCT
            A.ProdID,
            B.OprNum
        FROM
            #ProdRoute AS A
            JOIN 
                (
                    SELECT
                        ProdID,
                        MAX(MaxOpCompleted) AS 'OprNum'
                    FROM
                        #ProdRouteTran
                    GROUP BY
                        ProdID
                ) AS B
                ON A.ProdId = B.ProdId AND A.OprNum = B.OprNum
                    AND B.OprNum = (SELECT MAX(OprNum) FROM #ProdRoute WHERE ProdId = A.ProdId)
    ) AS [HoursB]
UNION ALL
SELECT
    *
FROM
    (
        SELECT
            ProdId,
            MIN(OprNum) AS 'OprNum'
        FROM
            #ProdRoute
        WHERE
            ProdId NOT IN 
                (SELECT ProdId FROM #ProdRouteTran)
            AND (SetupTime <> 0 OR ProcessTime <> 0)
        GROUP BY
            ProdId
    ) AS [NoHoursA]
UNION ALL
SELECT
    *
FROM
    (
        SELECT
            ProdId,
            MIN(OprNum) AS 'OprNum'
        FROM
            #ProdRoute
        WHERE
            ProdId NOT IN 
                (SELECT ProdId FROM #ProdRouteTran)
        GROUP BY
            ProdId
        HAVING
            SUM(SetupTime) = 0 AND SUM(ProcessTime) = 0
    ) AS [NoHoursB]

【讨论】：

【解决方案3】：

我不确定我是否理解你的问题，但这是我的尝试：

SELECT
    pr.ProdId,
    CASE 
        WHEN SUM(SetupTime) + SUM(ProcessTime) > 0 THEN MAX(x.OprNum)
        ELSE MAX(pr.OprNum)
    END
FROM ProdRoute pr
INNER JOIN (
    SELECT ProdID, MAX(MaxOpCompleted) AS OprNum
    FROM ProdRouteTran
    GROUP BY ProdID
)prt
    ON prt.ProdId = pr.ProdID
    AND prt.OprNum = pr.OprNum
OUTER APPLY(
    SELECT TOP 1 OprNum FROM ProdRoute 
    WHERE 
        ProdId = pr.ProdId
        AND OprNum > pr.OprNum
    ORDER BY OprNum
)x
GROUP BY pr.ProdId
ORDER BY pr.ProdId

【讨论】：

【解决方案4】：

试试这个 -

-- display the next operation, if condition match
SELECT do_exists.ProdId, do_exists.OprNum
FROM ProdRoute pr
INNER JOIN ProdRouteTran prt 
    ON prt.ProdId = pr.ProdId 
    AND pr.OprNum = prt.MaxOpCompleted 
    AND (pr.SetupTime + pr.ProcessTime) > 0
OUTER APPLY (
    SELECT TOP(1) pr.* 
    FROM ProdRoute pr
    WHERE prt.ProdID = pr.ProdId
    AND   pr.OprNum > prt.MaxOpCompleted
    ORDER BY pr.OprNum
) do_exists


UNION ALL

-- display the max operation, if matching data is not found in ProdRoute. 
---- Matching Data not found - 1) There is entry in ProdRoute for particular ProdId but hours is not present
----                           2) There is no entry in ProdRoute for a particular ProdId    
SELECT pr.ProdId, MAX(pr.OprNum) OprNum
FROM ProdRoute pr
LEFT JOIN (
    SELECT pr.ProdId
    FROM ProdRoute pr
    INNER JOIN ProdRouteTran prt 
        ON prt.ProdId = pr.ProdId 
        AND pr.OprNum = prt.MaxOpCompleted 
        AND (pr.SetupTime + pr.ProcessTime) > 0
) pr_ex ON pr_ex.ProdId = pr.ProdId
WHERE pr_ex.ProdId IS NULL 
GROUP BY pr.ProdId

【讨论】：

【解决方案5】：

我用这个SQL Fiddle 得到了正确的结果。

但是我不确定我是否完全理解 nothing >0 的情况。包含所有案例的更多数据可能会有用。

; With data as (
    Select r.ProdId
    , opr = case when h > 0 then  isnull(min(p.OprNum), r.OprNum) else  max(p.OprNum) end
    From (
        Select pr.ProdId, pr.OprNum, h = max(pr.SetupTime + pr.ProcessTime)     
        From ProdRoute as pr
        Inner Join ProdRouteTran as prt on pr.ProdId = prt.ProdID and pr.OprNum = prt.MaxOpCompleted
        Group By pr.ProdId, pr.OprNum
    ) as r
    left join ProdRoute as p on p.ProdId = r.ProdId and p.OprNum > r.OprNum
    Group By r.ProdId, r.OprNum, r.h
)
Select * From data

【讨论】：

【解决方案6】：

我不完全确定我是否理解您想要做的事情，但这是否是等价的？

SELECT
   t.ProdId,
   CASE WHEN r.OprNum IS NULL THEN t.MaxOpCompleted ELSE r.OprNum END AS OprNum
FROM
   ProdRouteTran t
   LEFT JOIN
      ProdRoute r
   ON
      r.ProdId = t.ProdId AND r.SetupTime + r.ProcessTime > 0 AND
      r.OprNum > t.MaxOpCompleted AND NOT EXISTS(
         SELECT * FROM ProdRoute p WHERE p.ProdId = t.ProdId AND
            p.OprNum > t.MaxOpCompleted AND p.OprNum < r.OprNum)

【讨论】：