This is a meme about running SQL queries that take forever because you typed something wrong that can either delete all rows or fetch all rows. The SQL query is "ONE SELECT FROM VERY BIG TABLE, ADD 8 JOINS, 5 SUBQUERIES AND ONE GROUP BY. NO INDEX, PLEASE I'M ALLERGIC TO THEM.
https://files.mastodon.social/media_attachments/files/112/021/311/871/586/194/original/97d0fb1075f82db4.png