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what is the worst that could happen to my database if my PHP code has a SQL injection vulnerability in the where statement, ie SELECT * FROM table WHERE id='$unescapedstring'?
sorry forgot to mention mysql
While the other answers are completely correct, if you have your mysql user accounts set up correctly, the account executing those queries probably shouldn’t have permissions to alter/create/drop tables/databases. Therefore, worst that could happend in that scenario:
DELETE FROM table