sql select from one table where not in another table code example

Example 1: select from one table where not on the other

SELECT id FROM a.table
WHERE id NOT IN (SELECT b.id FROM b.id)

Example 2: sql values not in another table

-- Find missing t1 values in t2 (based on 'id' field)
SELECT * FROM t1 WHERE t1.id NOT IN (SELECT id FROM t2);
-- or
SELECT * FROM t1 WHERE NOT exists (
    SELECT NULL FROM t2 WHERE t2.id = t1.id
);
-- or
SELECT t1.* FROM t1 LEFT OUTER JOIN t2 ON t2.id = t1.id WHERE t2.id IS NULL;