pub struct Account {
  id : Int64?
  email : String
  balance : Double
  team_id : Int64
  status : String
  level : Int
}

pub struct User {
  id : Int64?
  name : String
  email : String
}

fn demo_ddl(d : Int) -> String

fn demo_query(use_where : Bool, use_limit : Bool) -> String

fn demo_user_columns(d : Int) -> String

fn demo_user_ddl(d : Int) -> String