Select duplicated values from one column and get there value in one row

Question

I have a table with 2 columns like this:

+----------+----------+
| Column A | Column B |
+----------+----------+
|      123 |    ABC   |
|      123 |    XYC   |
|      123 |    FGH   |
|      145 |    QWE   |
|      147 |    YUI   |
+----------+----------+

I want to select all values from table but view it - like this:

+----------+---------+---------+----------+
| Column A | value 1 | value 2 | value 3  |
+----------+---------+---------+----------+
|      123 | ABC     | XYC     | FGH      |
|      145 | QWE     |         |          |
|      147 | YUI     |         |          |
+----------+---------+---------+----------+

Answer 1

If you're not trying to create extra columns in your output, you can simply use GROUP_CONCAT with the separator of your choice. For example:

SELECT `Column A`, 
       GROUP_CONCAT(`Column B` SEPARATOR ' | ') AS `Values`
FROM table1
GROUP BY `Column A`

Output:

Column A    Values
123         ABC | XYC | FGH
145         QWE
147         YUI

Demo on dbfiddle