[piaste]

This is the one I use too. Tiny difference - I write

   select * -- delete
   from sales
   where customer = 1

so it's even harder to accidentally highlight the 'delete' part.

Although I've switched to DBeaver for a year now, and it automatically pops up a warning when it detects a DELETE query without a WHERE, which is very nice.

[samus]

DBeaver has something even better, albeit sometimes annoying: you can define a connection as "Production" (highlighted red) and "Test" (green). On Production systems, DBeaver will ask you for confirmation for every write statement.