SQL 查找重复项并获取其他值的查询

Question

这是我的问题。我想找到重复的 'code ifls' 并获取我获得此重复代码的不同仓库

这是 table 的样子：

| code ifls | warehouse | 
|    4013   |        1  | 
|    4013   |        2  | 
|    4013   |        3  | 
|    4014   |        4  | 
|    4014   |        5  | 
|    4015   |        5  |

结果应如下所示：

| code ifls | warehouse | warehouse | warehouse |
|    4013   |     1     |     2     |     3     | 
|    4014   |     4     |     5     |           |

我尝试了那个请求但没有成功...

SELECT code ifls as ifls, (SELECT warehouse FROM catalogue WHERE code ifls= ifls) 
FROM catalogue GROUP BY code ifls HAVING COUNT(code ifls) > 1

您如何在 SQL 查询中表达这一点？

Answer 1

您可以使用子选择和 group_concat

select `code ifls`, group_concat(warehouse) 
from table  
where `code ifls` in (
    select `code ifls`, count(*)  
    from table 
    group by `code ifls`
    having count(*) > 1
)
group by `code ifls`

Answer 2

这是您的代码-

SELECT `code ifls`, 
SUBSTRING_INDEX(GROUP_CONCAT(warehouse),',',1) AS warehouse_1, 
IF((LENGTH(GROUP_CONCAT(warehouse)) - LENGTH(GROUP_CONCAT(warehouse SEPARATOR ''))) < 1,'',SUBSTRING_INDEX(SUBSTRING_INDEX(GROUP_CONCAT(warehouse),',',2),',',-1)) AS warehouse_2, 
IF((LENGTH(GROUP_CONCAT(warehouse)) - LENGTH(GROUP_CONCAT(warehouse SEPARATOR ''))) < 2,'',SUBSTRING_INDEX(GROUP_CONCAT(warehouse),',',-1)) AS warehouse_3 
FROM `catalogue`
GROUP BY `code ifls`;

Answer 3

GROUP_CONCAT() 可能是完成您想要做的事情的最简单方法，而不会使用动态列使事情复杂化；

SELECT `code ifls`, GROUP_CONCAT(warehouse) warehouses
FROM myTable
GROUP BY `code ifls`
HAVING COUNT(*) > 1

An SQLfiddle to test with.

它基本上为每个 code ilfs 提供逗号分隔的仓库列表，但 HAVING 将其限制为具有多个仓库的行。

SQL 查找重复项并获取其他值的查询

SQL query for finding duplicate and get others values

mysql

sql

count

having