sql - MySQL: Query form two separate ID lists and make one unified list, without duplicate values -

i have table below , trying merge block user , block columns , remove intersect values , create list of unique numbers, literally failing specific users block list.

|------------------------------------------------------ |block_id  | block_user |  block_by  |  block_at |------------------------------------------------------ | 1        | 22         | 1          | 1434451573 | 7        | 59         | 1          | 1434695298 | 10       | 4          | 1          | 1434695327 | 11       | 1          | 14         | 1434695349 

i need following, needs query id of 1 ;

|----------- |block_list  |----------- | 4 | 14 | 22 | 59 

i trying sql following , literally failed desired results;

select block_user blocked_user block_list union   select block_by blocked_list block_list (block_user =  '1' or block_by =  '1') 

if 1 excluded can use this:

select * (     select block_user id     yourtable     union     select block_by id     yourtable ) dat dat.id <> 1 

maybe want add where block_user = 1 subquery if it's needed in logic. wasn't clear.