`insert into A select * from A`?

It doesn’t seem possible to chain db.insertInto("A").selectFrom("A").selectAll().

It that possible in some other way? A workaround is to first fetch the rows from A and then insert them, however that incurs an extra roundtrip to the database.

[koskimas]

This is now implemented and will be released with the next version. The typings are not as strict as the maybe could be. For example the types don’t complain about this:

db.insertInto('person')
  .columns(['first_name'])
  .expression(db.selectFrom('pet').select(['name', 'species']))

insert into "person" ("first_name")
select "name", "species" from "pet"

even though the SQL is incorrect. You can’t insert two values when only one (first_name) is listed. This is difficult to type correctly because of all the implicit type conversions done by database engines. We could ignore the types and only make sure there’s the same amount of columns in both, but even that is a bit tricky with typescript. We can enhance this later.

[koskimas]

which weakens the library’s purpose

Really? Feel free to use knex 😉

db.selectFrom(...).values(...).set(...)

Do you really think it’s a problem that this is possible? Imagine a person that would write that. What would they think it would do? A person that writes that “query” clearly has no idea what SQL is. I don’t really see that being a problem even though it is possible. Theory is one thing, reality is another.