> The check expression is not limited to having only one column as its term(s). Either we're on different pages, or I misunderstand the syntax diagram. From the [syntax diagram](https://sqlite.org/syntax/column-def.html) the constraint no matter how it is 'fired' (triggers or not), and what other columns it may include in its expression, it is associated with a single column during table definition. That column name I'm talking about, it's always the same for a given constraint. At any rate, if that's something that can be done without unreasonably affecting performance, it'd be good to have. If not, life goes on!