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I accidentally removed the WHERE clause from my SQL query in a personal tool. Every row is now the same. I overwrote 206,000+ rows. I have no backup, I am stupid. (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by drekly@lemmy.world to c/programming@programming.dev

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"UPDATE table_name SET w = $1, x = $2, z = $4 WHERE y = $3 RETURNING *",

does not do the same as

"UPDATE table_name SET w = $1, x = $2, y = $3, z = $4 RETURNING *",

It's 2 am and my mind blanked out the WHERE, and just wanted the numbers neatly in order of 1234.

idiot.

FML.

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[–] originalfrozenbanana@lemm.ee 85 points 1 year ago (1 children)

This doesn’t help you but may help others. I always run my updates and deletes as selects first, validate the results are what I want including their number and then change the select to delete, update, whatever

[–] NOPper@lemmy.world 23 points 1 year ago

I learned this one very early on in my career as a physical security engineer working with access control databases. You only do it to one customer ever. 🤷‍♂️