Question

I have tables like this:

   Table1                Table2
   name1 | link_id      name2  |  link_id
   text       1         text         2
   text       2         text         4

And I wanna have result:

name1     name2     link_id
text      text         1
text      text         2
text      text         4

How I can do this?

ADD:
Sry, my English in not good. I have device, device_model and device_type tables with duplicate field counter_set_id. I wanna select fields from counter_set with all values of counter_set_id. I need to fetch values only from counter_set_id fields

Now I have this query:

SELECT  `dev`.`counter_set_id`, `mod`.`counter_set_id`, `type`.`counter_set_id`
FROM    `device` AS `dev`
LEFT JOIN   `device_model` AS `mod` ON `dev`.`device_model_id` = `mod`.`id`
LEFT JOIN   `device_type` AS `type` ON `mod`.`device_type_id` = `type`.`id`
WHERE   `dev`.`id` = 4;

This returns 3 columns but I need all values in one column

This is final variant I think:

SELECT  `dev`.`counter_set_id`
FROM        `device` AS `dev` LEFT OUTER JOIN
        `device_model` AS `mod` ON `dev`.`device_model_id` = `mod`.`id`
WHERE   `dev`.`id` = 4 AND
        `dev`.`counter_set_id` IS NOT NULL
UNION
SELECT  `mod`.`counter_set_id`
FROM        `device_model` AS `mod` LEFT OUTER JOIN
        `device` AS `dev` ON `mod`.`id` = `dev`.`device_model_id`
WHERE   `mod`.`counter_set_id` IS NOT NULL;

Answer 1

Based on the sample tables and desired output you provided, it sounds like you might want a FULL OUTER JOIN. Not all vendors implement this, but you can simulate it with a LEFT OUTER join and a UNION to an EXCEPTION join with the tables reversed like this:

Select name1, name2, A.link_id
From table1 A Left Outer Join
     table2 B on A.link_id = B.link_id
Union
Select name1, name2, link_id
From table2 C Exception Join
     table1 D on C.link_id = D.link_id

then your output would be like this:

NAME1   NAME2    LINK_ID
=====   =====    =======
text    <NULL>         1
text    text           2
<NULL>  text           4