Even seniors make mistakes. In case you were ever doubting yourself - just remember that.

I just had a very senior level programmer on my staff add a function to a production system that issues an SQL UPDATE query without a WHERE clause. Fortunately, only the 1st entry succeeded and the rest failed due to "duplicate record" errors. Clearly he had intended to do a SELECT to check if an entry was present. If it was present, do an UPDATE, otherwise do an INSERT (think UPSERT - but done manually). However instead in the insert part they were both UPDATE's. The first update was normal looking but the second UPDATE was just this weird malformed-looking thing where he tried to do an UPDATE but to every field including the key fields. Clearly he was thinking about an insert but actually writing it as an update. Every now and then I need to remind myself that these things happen. The guy's not dumb - just made a mistake.

I'm just happy it "failed unsuccessfully".