Question

我想检查该行是否有任何重复记录。按表结构表示

if（C1_CADNO = C2_CADNO或C1_CADNO = C3_CADNO或C2_CADNO = C3_CADNO）然后显示该记录

我的表有10列，如C1_CADNO ..... C10_CADNO

Answer 1

试试这个：

SELECT * FROM T WHERE 

   C1_CADNO IN (C2_CADNO,C3_CADNO,C4_CADNO,...C10_CADNO)
   OR 
   C2_CADNO IN (C3_CADNO,C4_CADNO,...C10_CADNO)
   OR 
   C3_CADNO IN (C4_CADNO,...C10_CADNO)
   OR 
   C4_CADNO IN (C5_CADNO,...C10_CADNO)
   ...
   OR 
   C8_CADNO IN (C9_CADNO,...C10_CADNO)
   OR 
   C9_CADNO = C10_CADNO

Answer 2

将其移至WHERE子句：

SELECT t.* FROM TableName t
WHERE ( C1_CADNO = C2_CADNO 
     OR C1_CADNO = C3_CADNO 
     OR C2_CADNO = C3_CADNO )

但我的桌子有10列像 C1_CADNO，C2_CADNO，C3_CADNO ..... C10_CADNO -

然后这个SQL就是为你而生的：

SELECT t.* FROM TableName t
WHERE ( t.C1_CADNO = t.C2_CADNO 
     OR C1_CADNO = C3_CADNO 
     OR C1_CADNO = C4_CADNO
     OR C1_CADNO = C5_CADNO 
     OR C1_CADNO = C6_CADNO 
     OR C1_CADNO = C7_CADNO 
     OR C1_CADNO = C8_CADNO 
     OR C1_CADNO = C9_CADNO 
     OR C1_CADNO = C10_CADNO 
     OR C2_CADNO = C3_CADNO 
     OR C2_CADNO = C4_CADNO 
     OR C2_CADNO = C5_CADNO 
     OR C2_CADNO = C6_CADNO 
     OR C2_CADNO = C7_CADNO 
     OR C2_CADNO = C8_CADNO 
     OR C2_CADNO = C9_CADNO 
     OR C2_CADNO = C10_CADNO 
     OR C3_CADNO = C4_CADNO 
     OR C3_CADNO = C5_CADNO
     OR C3_CADNO = C6_CADNO
     OR C3_CADNO = C7_CADNO
     OR C3_CADNO = C8_CADNO
     OR C3_CADNO = C9_CADNO
     OR C3_CADNO = C10_CADNO
     OR C4_CADNO = C5_CADNO 
     OR C4_CADNO = C6_CADNO
     OR C4_CADNO = C7_CADNO
     OR C4_CADNO = C8_CADNO
     OR C4_CADNO = C9_CADNO
     OR C4_CADNO = C10_CADNO
     OR C5_CADNO = C6_CADNO
     OR C5_CADNO = C7_CADNO
     OR C5_CADNO = C8_CADNO
     OR C5_CADNO = C9_CADNO
     OR C5_CADNO = C10_CADNO
     OR C6_CADNO = C7_CADNO
     OR C6_CADNO = C8_CADNO
     OR C6_CADNO = C9_CADNO
     OR C6_CADNO = C10_CADNO
     OR C7_CADNO = C8_CADNO
     OR C8_CADNO = C9_CADNO
     OR C8_CADNO = C10_CADNO
     OR C9_CADNO = C10_CADNO
)

现在你知道为什么它对normalize表很重要了; - ）

Answer 3

不要枚举所有排列，只需计算行中的不同值。如果计数太小，那么你必须有重复。

SELECT *
FROM T
WHERE (
  SELECT COUNT(DISTINCT value)
  FROM (VALUES (C1_CADNO),(C2_CADNO),(C3_CADNO),(C4_CADNO),(C5_CADNO),(C6_CADNO),(C7_CADNO),(C8_CADNO),(C9_CADNO),(C10_CADNO) ) t(value)
) < 10

Answer 4

这会有效，

select CADNO,count(*) cnt from 
(select C1_CADNO [CADNO] from table1
union all
select C2_CADNO from table1
......
....
select C10_CADNO from table1
)t4 group by CADNO
having count(*)>1

检查sql server中特定行的重复记录

4 个答案: