Insert data from other table (websql)

I'm trying to send data from items table to the order_items table (where order_id is unique for that order, so for all items it will be the same). So how can I retrieve data directly from the items table?

        
var itemsSql = "CREATE TABLE IF NOT EXISTS items (" +
            "item_id                    INTEGER         PRIMARY KEY," +
            "item_name                  VARCHAR(140)    NOT NULL," +
            "item_description   VARCHAR(255)    NOT NULL," +
            "list_price                 DECIMAL(5,2)    NOT NULL );";
        
var orderItemsSql = "CREATE TABLE IF NOT EXISTS  order_items (" +
            "order_id                   INTEGER," +
            "item_id                    INTEGER," +
            "quantity                   INTEGER                 NOT NULL," +
            "FOREIGN KEY (order_id) REFERENCES orders (order_id)," +
            "FOREIGN KEY (item_id) REFERENCES items (item_id) );";

function addOrderItems(order_id) {
    var sqlString = "INSERT INTO order_items (order_id, item_id, quantity)" +
    "VALUES( ?, ?, ?)";
    var getItemId = "SELECT item_id FROM cart";
    var getQuantity = "SELECT quantity FROM cart";

    db.transaction(function (tx) {
        tx.executeSql(sqlString, [$('#orderId').val(),item_id,quanity ],
                function (tx, res) {
                    console.debug("done!");

                }, errorHandler);
    });
}