SQL: Selecting IDs that don't have any rows with a certain value for a column

Question

I want to select the distinct IDs (which is associated with multiple rows) that DOESN\'T have any rows where VAL = \'current\'.

For example, in a table like this:

Answer 1

SELECT DISTINCT id
FROM table
WHERE id NOT IN (SELECT id
                 FROM table
                 WHERE val = 'current')

or:

SELECT a.id
FROM table a
LEFT JOIN table b ON a.id = b.id AND b.val = 'current'
WHERE b.id IS NULL