SQL：比较列以获取集合的精确匹配

Question

我有一个 table 看起来像这样：

RN    ID1     ID2     Name            Source
1   W76544  945297  1_W_HO          HO
2   W76544  945297  1_W_INT         Int
1   W76547  945299  3_W_HO          HO
2   W76547  945678  3_W_INT         Int
1   W76561  NULL    Dev_U_W         AD
2   W76561  207283  Dev_W_HO        HO
3   W76561  207283  Dev_W_INT       Int
1   W76562  207284  Dev_R_HO        HO
2   W76562  207284  Dev_R_INT       Int
3   W76562  NULL    Dev_U_R         AD
1   W76563  NULL    Prd_U_W         AD
2   W76563  NULL    Prd_W_HO        HO
3   W76563  NULL    Prd_W_INT       Int

我正在想办法确定 ID1 和 ID2 组之间的精确匹配。例如，此示例是完全匹配：

RN    ID1     ID2     Name            Source
1   *W76544 945297* 1_W_HO          HO
2   *W76544 945297* 1_W_INT         Int

我希望结果如下所示：

RN    ID1     ID2  Matched   Name            Source
1   W76544  945297   Yes    1_W_HO          HO
2   W76544  945297   Yes    1_W_INT         Int
1   W76547  945299   No     3_W_HO          HO
2   W76547  945678   No     3_W_INT         Int
1   W76561  NULL     No     Dev_U_W         AD
2   W76561  207283   No     Dev_W_HO        HO
3   W76561  207283   No     Dev_W_INT       Int
1   W76562  207284   No     Dev_R_HO        HO
2   W76562  207284   No     Dev_R_INT       Int
3   W76562  NULL     No     Dev_U_R         AD
1   W76563  NULL     Empty  Prd_U_W         AD
2   W76563  NULL     Empty  Prd_W_HO        HO
3   W76563  NULL     Empty  Prd_W_INT       Int

澄清...匹配 = 'Yes' 当所有具有相同 ID1 的组匹配到所有具有相同 ID2 的组时。 Match = 'No' 当具有相同 ID1 的组不是都匹配到类似的 ID2 或某些 ID1 的匹配但集合中的其他组根本不匹配 ID2。 Match = 'Empty' 当具有相同 ID1 的所有组根本不匹配 ID2 时。

p.s。 RN row_number 按 ID1

分区和排序

谢谢！！！

@BaconBits，这似乎与您的查询不符：

1   W10151820   NULL    No  DEV_U_W         AD
2   W10151820   212405  Yes DEV_W_HO    HO
3   W10151820   212405  Yes DEV_W_INTL  Int

Answer 1

你能做这样的事情吗：

SELECT m.RN,
    m.ID1,
    m.ID2,
    CASE WHEN NOT EXISTS (SELECT 1 FROM MyTable WHERE ID1 = m.ID1 AND ID2 IS NOT NULL) THEN 'Empty'
        ELSE CASE WHEN COUNT(*) OVER(PARTITION BY m.ID1, m.ID2) > 1 THEN 'Yes' 
                ELSE 'No'
            END
    END "Matched",
    m.Name,
    m.Source
FROM MyTable m

丑陋至极，但我认为这应该可行。

Answer 2

我认为使用解析函数可能更容易：

select id1, id2,
       (case when cnt_1 = cnt2 and min_1_2 = max_1_2 and min_2_1 = max_2_1 and
                  cnt_1 = cnt_2_notnull
             then 'Yes'
             when cnt_2_notnull > 0
             then 'No'
             else 'Empty'
        end) as flag
from (select t.id1, t.id2,
             count(id1) over (partition by id2) as cnt_2_notnull,
             count(*) over (partition by id1) as cnt_1,
             count(*) over (partition by id2) as cnt_2,
             min(id1) over (partition by id2) as min_1_2,
             max(id1) over (partition by id2) as max_1_2,
             min(id2) over (partition by id1) as min_2_1,
             max(id2) over (partition by id1) as max_2_1
      from table t
     ) t;

逻辑是计算每个维度上值的数量（id1 和 id2）并比较每个维度上的最小值和最大值。

Answer 3

为了将来保持简洁、轻便和易于理解，我会使用 CTE 来计算 Matched 参数。

然后我会将结果合并在一起。

工作示例：link

with CTE_CheckID as ( Select ID1,  [Matched] = 
CASE WHEN count(distinct ID2) = 1 AND count(distinct coalesce(id2, id1)) = 1 THEN 'Yes' ELSE
CASE WHEN count(distinct ID2) = 0 AND count(distinct coalesce(id2, id1)) = 1 THEN 'Empty' ELSE 'No' END END
FROM TABLE1
group by ID1 )

select t1.RN, 
  t1.ID1, 
  t1.ID2, 
  cID.Matched,
  t1.name,
  t1.Source
from table1 t1
left join CTE_CheckID cID on t1.ID1 = cID.ID1

Answer 4

试试这个：

Create table t(id int, c char(1))

Insert into t values
(1, 'a'),
(1, 'a'),
(2, 'b'),
(2, null),
(3, null),
(3, null),
(4, 'c'),
(4, 'd')

;with cte as(
select id, count(*) c1, count(c) c2, count(distinct c) c3 from t
group by id)
select t.id, t.c, ca.m from t
Cross apply(select case when c2 = 0 and c3 = 0 then 'empty'
            when c1 = c2 and c3 = 1 then 'yes'
            else 'no' end as m
            from cte where cte.id = t.id) ca

输出：

id  c       m
1   a       yes
1   a       yes
2   b       no
2   (null)  no
3   (null)  empty
3   (null)  empty
4   c       no
4   d       no

Answer 5

这个怎么样？你能把 'YourTableNameHere' 换成你的 table 名字试试吗？

WITH
  A AS (
    SELECT
      X.ID1, X.ID2,
      COUNT(1) AS Hits
    FROM YourTableNameHere X
    GROUP BY X.ID1, X.ID2
    HAVING COUNT(1) > 1
  ),
  B AS (
    SELECT
      X.ID1,
      SUM(CASE WHEN X.ID2 IS NULL THEN 0 ELSE 1 END) AS Hits,
      SUM(CASE WHEN X.ID2 IS NULL THEN 1 ELSE 0 END) AS Nulls
    FROM YourTableNameHere X
    GROUP BY X.ID1
    HAVING COUNT(1) > 1
  )
SELECT
  X.RN, X.ID1, X.ID2,
  CASE
    WHEN A.Hits = B.Nulls THEN 'Empty'
    WHEN A.Hits = B.Hits + B.Nulls THEN 'Yes'
    ELSE 'No'
  END AS [Matched],
  X.[Name], X.[Source]
FROM
  YourTableNameHere X
  LEFT JOIN A
    ON
      A.ID1 = X.ID1
      AND (A.ID2 = X.ID2 OR (A.ID2 IS NULL AND X.ID2 IS NULL))
  LEFT JOIN B ON B.ID1 = X.ID1 ;

SQL：比较列以获取集合的精确匹配

SQL: Compare Columns for Exact Match of sets

sql

tsql

sql-server

analytics

ssms