Query to exclude identical records with the output of one instance?

Question

MySQL

Good afternoon.
Whether it is possible to display the data by request, having excluded duplicates?
Or to disassemble everything with the help of cycles in the code?
Let's say there is
testId
1, 2, 3, 10, 8, 4, 5, 6, 3, 4, 1, 5, 7, 9, 11, 6
testId2
7, 9, 10, 8, 4, 1, 2, 3 , 5, 11, 6 5, 6, 3, 4, 1
Result:
testId: 1,2,3,4,5,6,7,8,9,10,11
testId2: 1,2,3,4, 5,6,7,8,9,10,11

Answer 1

2sql.ru/basic/sql-distinct
In some cases Group By