添加期末大作业文件夹Project，目前与Assignment5中一致

Project/db.sql

@@ -0,0 +1,10 @@
+DROP TABLE IF EXISTS passengers;
+
+CREATE TABLE passengers (
+    ID BIGINT PRIMARY KEY,
+    `Name` VARCHAR (255) NOT NULL,
+    Phone_number BIGINT UNIQUE NOT NULL,
+    `Password` VARCHAR (255) NOT NULL,
+    CHECK (ID REGEXP '^\\d{18}$'),
+    CHECK (Phone_number REGEXP '^\\d{11}$')
+);