仅在存在多个匹配项时才包含条件

Question

我试图从 merged_products 表中获取 pID，在很多情况下，厚度、宽度、等级和长度与十几条或更多记录匹配，唯一的区别是其中一条将包含 AID。

我只需要在有不止一场比赛时包含 AID，但我不知道如何实现这一点。

CREATE TABLE #raw_customer (
    [DECIMAL] decimal(20, 4),
    [WIDTH] decimal(20, 4),
    [LENGTH] decimal(20, 4),
    [SAE] varchar(10),
    [CURR MNBR] varchar(255),
    [AID] varchar(255)
)
CREATE TABLE #merged_products (
    [pID] int,
    [Thickness] decimal(20, 4),
    [Width] decimal(20, 4),
    [Length] decimal(20, 4),
    [Grade] varchar(10),
    [MNumber] varchar(255),
    [Config] varchar(255),
    [AID] varchar(255)
)

INSERT INTO #raw_customer VALUES
(0.299, 48, 100, 'XB0', NULL,       ''),
(0.3,   60, 120, 'XB0', 'M723087',  ''),
(0.25,  48, 140, 'GR1', 'M701283',  '906008314'),
(0.25,  60, 140, 'Y45', NULL,       '008008314'),
(0.125, 72, 205, 'GR7', 'M712390',  '005003468')

INSERT INTO #merged_products VALUES
(1, 0.2990, 48.0000, 100.0000, 'XB0', NULL,     'Stock', ''),
(2, 0.3000, 60.0000, 120.0000, 'XB0', NULL,     'Stock', ''),
(3, 0.2500, 48.0000, 140.0000, 'GR1', 'M701283',    'Stock', ''),
(4, 0.2500, 60.0000, 140.0000, 'Y45', NULL,     'Raced', ''),
(5, 0.1250, 72.0000, 205.0000, 'GR7', 'M712390',    'Raced', '900751488; 006008314; '),
(6, 0.1250, 72.0000, 205.0000, 'GR7', 'M712390',    'Raced', '005003468; 006025951; 006022051')


SELECT
    mp.[pID],
    r.[DECIMAL],    mp.[Thickness],
    r.[WIDTH],      mp.[Width],
    r.[LENGTH],     mp.[Length],
    r.[SAE],        mp.[Grade],
    mp.[Config],    
    r.[CURR MNBR],  mp.[MNumber],
    r.[AID],        mp.[AID]
  FROM #raw_customer r
  LEFT JOIN #merged_products mp ON
    CAST(r.[DECIMAL] AS decimal(20,4))  = CAST(mp.[Thickness] AS decimal(20,4)) AND
    CAST(r.[WIDTH] AS decimal(20,4))    = CAST(mp.[Width] AS decimal(20,4)) AND
    CAST(r.[LENGTH] AS decimal(20,4))   = CAST(mp.[Length] AS decimal(20,4)) AND
    (
        (
            r.[CURR MNBR] IS NULL AND mp.[Config] = 'Stock'
        ) OR (
            r.[CURR MNBR] IS NOT NULL AND r.[CURR MNBR] IN ( SELECT value FROM STRING_SPLIT(mp.[MNumber],','))
        )
    ) AND
    r.[AID] = (
    CASE
        WHEN r.[AID] IN ( SELECT value FROM STRING_SPLIT(mp.[AID],',') ) THEN ( SELECT value FROM STRING_SPLIT(mp.[AID],',') )
        ELSE '' -- r.[AID] would need to match any value if not found in mp.[AID].  r.[AID] does have NULL values
    END ) AND
    r.[SAE] = mp.[Grade]
  GROUP BY
    mp.[pID], mp.[Thickness], mp.[Width], mp.[Length], mp.[Grade], mp.[MNumber], mp.[Config], mp.[AID], 
    r.[DECIMAL], r.[WIDTH], r.[LENGTH], r.[SAE], r.[CURR MNBR], r.[AID]
ORDER BY r.[AID]

这是我正在寻找的结果，特别是最后一个结果，它只从#5或#6中选择#6

|pID    |DECIMAL|Thickness|WIDTH|Width   |LENGTH| Length    |SAE    |Grade  |Config  |CURR MNBR |MNumber  |AID          |AID
|1      | 0.299 |   0.2990| 48  | 48.0000| 100  | 100.0000  | 'XB0' | 'XB0' | 'Stock'|NULL      |NULL     | ''          |NULL|
|2      | 0.3   |   0.3000| 60  | 60.0000| 120  | 120.0000  | 'XB0' | 'XB0' | 'Stock'|'M723087' |NULL     | ''          |NULL|
|3      | 0.25  |   0.2500| 48  | 48.0000| 140  | 140.0000  | 'GR1' | 'GR1' | 'Stock'|'M701283' |'M701283'| '906008314' |NULL|
|4      | 0.25  |   0.2500| 60  | 60.0000| 140  | 140.0000  | 'Y45' | 'Y45' | 'Raced'|NULL      |NULL     | '008008314' |NULL|
|6      | 0.125 |   0.1250| 72  | 72.0000| 205  | 205.0000  | 'GR7' | 'GR7' | 'Raced'|'M712390' |'M712390'| '005003468' |'005003468; 006025951; 006022051'|

Answer 1

我建议您将串联的辅助数据分解成行，同时计算行号，以便避免结果中的重复，例如

SELECT p.pID,Thickness,Width,Length,Grade,MNumber,Config, aid as xaid
    , trim(s.value) AS AID
    , coalesce(trim(nullif(s.value,' ')),'999999999')
    , row_number() OVER (
        PARTITION BY MNumber, Thickness, Width, Length, Grade 
        ORDER BY coalesce(trim(nullif(s.value,' ')),'999999999') ASC
        ) AS rn
FROM #merged_products AS p
OUTER APPLY STRING_SPLIT(case when p.aid <> ' ' then concat(';',p.AID) end, ';')  AS s

pID	厚度	宽度	长度	等级	M号码	配置	xaid	援助	（无栏名）	rn
4	0.2500	60.0000	140.0000	Y45	空	比赛		空	999999999	1
1	0.2990	48.0000	100.0000	XB0	空	库存		空	999999999	1
2	0.3000	60.0000	120.0000	XB0	空	库存		空	999999999	1
3	0.2500	48.0000	140.0000	GR1	M701283	库存		空	999999999	1
6	0.1250	72.0000	205.0000	GR7	M712390	比赛	005003468； 006025951； 006022051	005003468	005003468	1
5	0.1250	72.0000	205.0000	GR7	M712390	比赛	900751488； 006008314；	006008314	006008314	2
6	0.1250	72.0000	205.0000	GR7	M712390	比赛	005003468； 006025951； 006022051	006022051	006022051	3
6	0.1250	72.0000	205.0000	GR7	M712390	比赛	005003468； 006025951； 006022051	006025951	006025951	4
5	0.1250	72.0000	205.0000	GR7	M712390	比赛	900751488； 006008314；	900751488	900751488	5
5	0.1250	72.0000	205.0000	GR7	M712390	比赛	900751488； 006008314；		999999999	6
6	0.1250	72.0000	205.0000	GR7	M712390	比赛	005003468； 006025951； 006022051		999999999	7
5	0.1250	72.0000	205.0000	GR7	M712390	比赛	900751488； 006008314；		999999999	8

一旦获得此结果，我们就可以将其用作整体简化查询中的子查询：

SELECT mp.[pID]
    , r.[DECIMAL]
    , mp.[Thickness]
    , r.[WIDTH]
    , mp.[Width]
    , r.[LENGTH]
    , mp.[Length]
    , r.[SAE]
    , mp.[Grade]
    , mp.[Config]
    , r.[CURR MNBR]
    , mp.[MNumber]
    , r.[AID]
    , mp.[AID]
FROM #raw_customer r
LEFT JOIN (
    SELECT
          p.pID,Thickness, Width, Length, Grade, MNumber, Config, aid
        , trim(s.value) AS XAID
        , row_number() OVER (
            PARTITION BY MNumber, Thickness, Width, Length, Grade 
            ORDER BY coalesce(trim(nullif(s.value,' ')),'999999999') ASC
            ) AS rn
    FROM #merged_products AS p
    OUTER APPLY STRING_SPLIT(case when p.aid <> ' ' then concat(';',p.AID) end, ';')  AS s
    ) mp ON r.[DECIMAL] = mp.[Thickness]
    AND r.[WIDTH] = mp.[Width]
    AND r.[LENGTH] = mp.[Length]

pID	十进制	厚度	宽度	宽度	长度	长度	美国汽车工程师协会	等级	配置	当前 MNBR	M号码	援助	援助
1	0.2990	0.2990	48.0000	48.0000	100.0000	100.0000	XB0	XB0	库存	空	空
2	0.3000	0.3000	60.0000	60.0000	120.0000	120.0000	XB0	XB0	库存	M723087	空
3	0.2500	0.2500	48.0000	48.0000	140.0000	140.0000	GR1	GR1	库存	M701283	M701283	906008314
4	0.2500	0.2500	60.0000	60.0000	140.0000	140.0000	Y45	Y45	比赛	空	空	008008314
6	0.1250	0.1250	72.0000	72.0000	205.0000	205.0000	GR7	GR7	比赛	M712390	M712390	005003468	005003468； 006025951； 006022051

小提琴