MySQL搜索跨多列的重复

Question

APOLOGIES：我的意思是说，重复必须在同一列内。

我有以下代码：

SELECT m.* FROM ( 
    SELECT text 
    FROM mytable 
    GROUP BY text 
    HAVING COUNT(*) > 1) q 
JOIN mytable m 
ON m.text = q.text 

这使我能够搜索重复在列text和工作正常。但是，我有一个表：

q1a, q2a, q3a, q4a, q5a 

我想什么是对查询中的所有列重复检查 - 如果这可能和任何人都可以给我一个尖？

感谢，

H.

Answer 1

这可能是你需要的，它会给你重复的文本，以及找到匹配的行和列;

SELECT GROUP_CONCAT(id) ids,q1a text,1 col 
FROM myTable GROUP BY text HAVING COUNT(*)>1 
UNION 
SELECT GROUP_CONCAT(id),q2a text,2 
FROM myTable GROUP BY text HAVING COUNT(*)>1 
UNION 
SELECT GROUP_CONCAT(id),q3a text,3 
FROM myTable GROUP BY text HAVING COUNT(*)>1 
UNION 
SELECT GROUP_CONCAT(id),q4a text,4 
FROM myTable GROUP BY text HAVING COUNT(*)>1 
UNION 
SELECT GROUP_CONCAT(id),q5a text,5 
FROM myTable GROUP BY text HAVING COUNT(*)>1 

An SQLfiddle to test with。

Answer 2

如果我正确你已了解的问题，你可以使用这样的查询：

SELECT m.* 
FROM (
    SELECT txt FROM (
     SELECT q1a as txt FROM mytable 
     UNION ALL 
     SELECT q2a as txt FROM mytable 
     UNION ALL 
     SELECT q3a as txt FROM mytable 
     UNION ALL 
     SELECT q4a as txt FROM mytable 
     UNION ALL 
     SELECT q5a as txt FROM mytable) u 
    GROUP BY 
     txt 
    HAVING COUNT(*)>1) q 
    INNER JOIN mytable m 
    ON q.txt IN (m.q1a, m.q2a, m.q3a, m.q4a, m.q5a) 

请参阅小提琴here。