Delete statement

You can use operators @, @?, @*, @+ to specify cardinality, like for the at-operator. A run-time error occurs if the number of deleted records doesn't match the cardinality.

delete user @ { .name == 'Bob' };                    // exactly one
delete user @? { .name == 'Bob' };                   // zero or one
delete user @* { .company.name == 'Bad Company' };   // any number

Using multiple entities. It's similar to an update, where you delete only the objects of the first entity:

delete (u: user, c: company) @ { u.xyz == c.xyz, u.name == 'Bob', c.name == 'Google' };

Can specify an arbitrary expression returning an entity, a nullable entity, or a collection of entities:

val u = user @? { .name == 'Bob' };
delete u;