Question

I have a table like this:

+----+---------+---------+
| Id | column1 | column2 |
+----+---------+---------+
|  1 | a       | b       |
|  2 | a       | b       |
+----+---------+---------+

and a query like this SELECT * FROM table WHERE id IN (1,2,3)

what query do I need to get a result like this(I need to get null values for nonexisten id’s):

+----+---------+---------+
| Id | column1 | column2 |
+----+---------+---------+
|  1 | a       | b       |
|  2 | a       | b       |
|  3 | null    | null    |
+----+---------+---------+

EDIT

Thanks for the responses so far.

Is there a more ‘dynamic way’ to do this, the query above it’s just an example.
In reality I need to check around 1000 id’s!

Answer 1

You could use something like this:

SELECT ids.ID, your_table.column1, your_table.column2
FROM
  (SELECT 1 as ID
   UNION ALL SELECT 2
   UNION ALL SELECT 3) ids left join your_table
  on ids.ID = your_table.ID

First subquery returns each value you need in a different row. Then you can try to join each row with your_table. If you use a left join, all values from the first subquery are shown, and if there’s a match with your_table, values from your_table are shown, otherwise you will get nulls.