How to pass multiple insert commands to a query?

Question

PostgreSQL

The language is fundamental. I think the problem is common.

There is a request:

List<List<dynamic>> result = await connection.query("""
    DELETE
    FROM t1
    WHERE "aaa"='123';

    DELETE
    FROM t2
    WHERE "bbb"='123';
""");

It swears: “A trained guard fails to answer a few commands.

And how to be? I don't see queryAll in the library.