- Generous Backer | 633
perform join using composite key using database explorer
I don't think that composite key can be used instead of simple one-column primary key. I had a brief look into the documentation of https://api.nette.org/…entions.html and the corresponding source code of DiscoveredConventions and there is no evidence that composite key is supported for join database queries.
But I'am not an experienced user of Nette Explorer at all, so would be useful, if somebody with deep knowledge of Nette Explorer would confirm or reject this my answer.