Question

我正在尝试在SQL Server 2014中编写一个查询，该查询计算两个表中的行之间的重合次数（但只是当这些重合次数大于1时）到新列中。结构是这样的：

表-A：
   ================
  c1 | c2 | c3 | c4

11 | 30 | 70 | 90个
  20 | 80 | 95 | 99个
  15 | 39 | 40 | 41个
  ......

表-B：
   ================
  n1 | n2 | n3 | n4

30 | 65 | 90 | 95个
  20 | 80 | 90 | 99个
  15 | 80 | 95 | 99个
  ...

我希望在table_a中的列之后在查询中添加一列，如下所示：

查询：
   ================
  c1 | c2 | c3 | c4 | c5

11 | 30 | 70 | 90 | 2
  20 | 80 | 95 | 99 | 6
  15 | 39 | 40 | 41 | 0
  ......

换句话说，对于table_a中的每一行，检查table_b中每行匹配的数量，然后将所有大于1的结果相加并粘贴到table_a中的行旁边。

我有以下代码，但输出错误：

SELECT TOP (100) PERCENT dbo.table_a.c1, dbo.table_a.c2,  
    dbo.table_a.c3, dbo.table_a.c4, dbo.table_a.c5, dbo.table_a.c6,  
    COUNT('c1 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c2 = n1 or n2 or n3 or n4 or  n5 or  n6')  
    + COUNT('c3 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c4 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c5 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c6 = n1 or n2 or n3 or  n4 or  n5 or  n6') AS c5  
FROM  dbo.table_a CROSS JOIN dbo.[table_b]  
GROUP BY dbo.table_a.c1, dbo.table_a.c2, dbo.table_a.c3, dbo.table_a.c4,  
  dbo.table_a.c5, dbo.table_a.c6  
HAVING   (COUNT('c1 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c2 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c3 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c4 = n1 or n2 or n3 or  n4 or  n5 or  n6')  
    + COUNT('c5 = n1 or n2 or n3 or  n4 or  n5 or  n6')   
    + COUNT('c6 = n1 or n2 or n3 or  n4 or  n5 or  n6') > 1)
ORDER BY c5 DESC

任何帮助都会受到赞赏，谢谢！

Answer 1

;with cte(n) as(
    select n1 from table_b union all
    select n2 from table_b union all
    select n3 from table_b union all
    select n4 from table_b
)
,counted(n, c) as(
    select n, c = count(n) from cte group by n
)
select
    a.*, b.cc
from table_a a
cross apply(
    select cc = sum(case when c > 1 then c else 0 end)
    from counted
    where
        n = a.c1
        or n = a.c2
        or n = a.c3
        or n = a.c4
)b

计算两个表中行之间的重合

1 个答案: