Union, intersect, except

```javascript
{
  type: 'intersect'
, all: true
, queries: [
    { type: 'select', table: 'users' }
  , { type: 'select', table: 'other_users' }
  ]
};

// => select "users".* from "users" intersect all select "other_users".* from "other_users"
```