this post was submitted on 11 Oct 2023
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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 11 months ago* (last edited 11 months 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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[–] AlphaOmega@lemmy.world 0 points 11 months ago* (last edited 11 months ago) (1 children)

This is a hard lesson to learn. From now on, my guess is you will have dozens of backups.

[–] ReluctantMuskrat@lemmy.world 0 points 11 months ago (1 children)

And always use a transaction so you're required to commit to make it permanent. See an unexpected result? Rollback.

[–] sim642@lemm.ee 0 points 11 months ago (1 children)

Transactions aren't backups. You can just as easily commit before fully realizing it. Backups, backups, backups.

[–] elvith@feddit.de 0 points 11 months ago

Yes, but

  1. Begin transaction
  2. Update table set x='oopsie'
  3. Sees 42096 rows affected
  4. Rollback

Can prevent a restore, whereas doing the update with auto commit guarantees a restore on (mostly) every error you make