Update README.md

README.md

@@ -14,4 +14,84 @@
 ## 🎯 프로젝트 목표
 
 
+<br/><br/>
+
+## 🧩 ERD
+
+``` mermaid
+erDiagram
+    MOVIE ||--o{ MOVIE_TIMES : ""
+    MOVIE {
+        bigint id PK "영화 ID"
+        varchar title "영화제목"
+        int running_time "러닝타임"
+        datetime created_at "등록일시"
+        datetime updated_at "수정일시"
+    }
+    THEATER ||--o{ MOVIE_TIMES : ""
+    THEATER ||--|{ SEAT : ""
+    THEATER {
+        bigint id PK "상영관 ID"
+        int theater_number "상영관 번호"
+        int seat_count "좌석수"
+        datetime created_at "등록일시"
+        datetime updated_at "수정일시"
+    }
+    SEAT ||--o{ TICKET : ""
+    SEAT {
+        bigint id PK "좌석 ID"
+        bigint theater_id FK "상영관 ID"
+        int column "열"
+        int row "행"
+        datetime created_at "등록일시"
+        datetime updated_at "수정일시"
+    }
+    MOVIE_TIMES ||--o{ TICKET : ""
+    MOVIE_TIMES {
+        bigint id PK "상영시간표 ID"
+        bigint movie_id FK "영화 ID"
+        bigint theater_id FK "상영관 ID"
+        date date "상영 날짜"
+        int round "회차"
+        time start_time "시작 시간"
+        time end_time "종료 시간"
+        datetime created_at "등록일시"
+        datetime updated_at "수정일시"
+    }
+    TICKET {
+        bigint id PK "티켓 ID"
+        bigint seat_id FK "좌석 ID"
+        bigint movie_times_id FK "상영시간표 ID"
+        bigint payment_id FK "결제 ID"
+        varchar ticket_status "상태 - 구매가능/예약진행중/판매완료"
+        int ticket_price "가격"
+        datetime created_at "등록일시"
+        datetime updated_at "수정일시"
+    }
+    TICKET }|--|| PAYMENT : ""
+    PAYMENT {
+        bigint id PK "결제 ID"
+        bigint user_id FK "유저ID"
+        varchar type "결제 타입 - 예) 네이버페이, 카카오페이"
+        varchar payment_status "상태 - 완료/환불/실패"
+        varchar failed_reason "실패사유 - 컬럼명을 알아보기 쉬운가?"
+        varchar payment_number "예매번호"
+        int total_price "결제 금액"
+        datetime created_at "결제일시"
+        datetime updated_at "수정일시"
+    }
+    USER ||--o{ PAYMENT : ""
+    USER {
+        bigint id "회원"
+        varchar password "비밀번호"
+        varchar grade "등급 - 고객/임직원"
+        varchar email "이메일"
+        varchar phone "휴대폰 번호"
+        boolean is_deleted "탈퇴여부"
+        datetime deleted_at "탈퇴일시"
+        datetime created_at "가입일시"
+        datetime updated_at "수정일시"
+    }
+```
+
 <br/><br/>