生成一个SQL查询，来查找所有在2023年1月1日之后购买过产品的客户姓名和电话。查询应涉及到名为"Customers"和"Orders"的表，其中"Customers"表有字段"CustomerID", "Name", "PhoneNumber"，"Orders"表有字段"OrderID", "CustomerID", "OrderDate"。请确保符合SQL语法规则。
user
```sql
SELECT c.Name, c.PhoneNumber
FROM Customers c
JOIN Orders o ON c.CustomerID = o.CustomerID
WHERE o.OrderDate > '2023-01-01'
```
assistant