Use LEFT JOIN
to join both table and t2.ID IS NULL
to remove common records
SELECT t1.* FROM table1 t1
LEFT JOIN table2 t2
ON t1.ID = t2.ID
WHERE t2.ID IS NULL
Output:
╔════╦═══════════╗
║ ID ║ SELECTION ║
╠════╬═══════════╣
║ 2 ║ Ely ║
║ 6 ║ Orly ║
║ 8 ║ Lee ║
╚════╩═══════════╝