Question

这是表格

id值名称

1    2    first
2    2    manger 
3    2    islam
4    2    cairo
5    3    frist 
6    3    manger 
7    3    ahmed
8    3    alex
9    4    second 
10   4    manger 
11   4    mark
12   4    london

希望将此列设为行并选择一些条件，以便所有＆＃39;首先

     c1       c2       c3      c4 
R1   first   manger    islam   cairo

R2   first   manger    ahmed   alex

可能吗？

Answer 1

您可以尝试使用CASE：

SELECT GROUP_CONCAT((CASE WHEN `id`%4 = 1 THEN `name` END)) AS `c1`
     , GROUP_CONCAT((CASE WHEN `id`%4 = 2 THEN `name` END)) AS `c2`
     , GROUP_CONCAT((CASE WHEN `id`%4 = 3 THEN `name` END)) AS `c3`
     , GROUP_CONCAT((CASE WHEN `id`%4 = 0 THEN `name` END)) AS `c4`
FROM `tbl`
GROUP BY `value`

Example

或IF

SELECT GROUP_CONCAT(IF(`id`%4 = 1 ,`name`, null)) AS `c1`
     , GROUP_CONCAT(IF(`id`%4 = 2 ,`name`, null)) AS `c2`
     , GROUP_CONCAT(IF(`id`%4 = 3 ,`name`, null)) AS `c3`
     , GROUP_CONCAT(IF(`id`%4 = 0 ,`name`, null)) AS `c4`
FROM `tbl`
GROUP BY `value`

SQLFiddle

在某些条件下将行转换为列

1 个答案: