Which method is best to select values present in one table but missing in another one? This: , this: or this: Finally, it’s MySQL time. As always, we will create the sample tables: Table creation details Table t_left contains 100,000 rows with 10,000 distinct values. Table t_right contains 1,000,000 rows with 10,000 distinct values. There … Continue reading NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: MySQL