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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 [email protected] to c/programming

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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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[–] [email protected] 10 points 1 year ago (1 children)

I have done this too. Shit happens.

One of my co-workers used to write UPDATE statements backwards limit then where etc, to prevent this stuff, feels like a bit of a faff to me.

[–] [email protected] 26 points 1 year ago (2 children)

I always write it as a select, before turning it into a delete or update. I have burned myself too often already.

[–] [email protected] 2 points 1 year ago

Oh I did that like a year ago.

And then last night had an error that led me back near this code and stupidly thought "hey it'd look neater if those numbers were in order"

[–] [email protected] 2 points 1 year ago

^ this is a very good tip that ive been using myself too