Databases: Why does this UPDATE fail with a unique key constraint violation?

Helpful? Please support me on Patreon: [ Ссылка ]

With thanks & praise to God, and with thanks to the many people who have made this project possible! | Content (except music & images) licensed under CC BY-SA [ Ссылка ] | Music: [ Ссылка ] | Images: [ Ссылка ] & others | With thanks to user ypercubeTM (dba.stackexchange.com/users/993), user jcaron (dba.stackexchange.com/users/82292), user infiniteLoop (dba.stackexchange.com/users/81976), user Dawny33 (dba.stackexchange.com/users/77248), user ArleyD (dba.stackexchange.com/users/82262), user alonk (dba.stackexchange.com/users/82277), and the Stack Exchange Network (dba.stackexchange.com/questions/123266). Trademarks are property of their respective owners. Disclaimer: All information is provided "AS IS" without warranty of any kind. You are responsible for your own actions. Please contact me if anything is amiss at Roel D.OT VandePaar A.T gmail.com

свернуть