もちろんです！以下は、前述の要件に対応するデータベース・スキーマのサンプルです：
```sql
CREATE TABLE Customers (
  customer_id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  address VARCHAR(255) NOT NULL,
  phone VARCHAR(20) NOT NULL,
  email VARCHAR(100) NOT NULL
);

CREATE TABLE Invoices (
  invoice_id INT AUTO_INCREMENT PRIMARY KEY,
  customer_id INT NOT NULL,
  date_issued DATE NOT NULL,
  due_date DATE NOT NULL,
  amount DECIMAL(10,2) NOT NULL,
  status ENUM('paid', 'overdue') NOT NULL,
  FOREIGN KEY (customer_id) REFERENCES Customers(customer_id)
);
```
説明
- Customers テーブルには、名前、住所、電話、電子メールなどの顧客情報が格納されます。
- 請求書テーブルには、各顧客に発行された請求書とその期日、金額が格納されます。請求書のステータスは、'支払い済み'または'期限切れ'のいずれかで追跡されます。
- Invoicesテーブルのcustomer_idは、Customersテーブルのcustomer_idを参照する外部キーで、2つのテーブル間のリレーションを確立します。
Sure! Here is a sample database schema for the mentioned requirements:
```sql
CREATE TABLE Customers (
  customer_id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(100) NOT NULL,
  address VARCHAR(255) NOT NULL,
  phone VARCHAR(20) NOT NULL,
  email VARCHAR(100) NOT NULL
);

CREATE TABLE Invoices (
  invoice_id INT AUTO_INCREMENT PRIMARY KEY,
  customer_id INT NOT NULL,
  date_issued DATE NOT NULL,
  due_date DATE NOT NULL,
  amount DECIMAL(10,2) NOT NULL,
  status ENUM('paid', 'overdue') NOT NULL,
  FOREIGN KEY (customer_id) REFERENCES Customers(customer_id)
);
```
Explanation:
- The Customers table stores the customer information such as name, address, phone, and email.
- The Invoices table stores the invoices issued to each customer along with their due date and the amount. The status of the invoice is also tracked as either 'paid' or 'overdue'.
- The customer_id in the Invoices table is a foreign key that references the customer_id in the Customers table to establish the relationship between the two tables.