diff --git a/erd.png b/erd.png
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diff --git a/queries.sql b/queries.sql
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+/* 1. 내 정보 업데이트 하기 */
+UPDATE _TDAUser 
+SET UserName = 'test' 
+WHERE UserId = 1;
+
+/* 2. 내가 생성한 상품 조회 (UserId=1, 최신순, 3페이지) */
+SELECT * FROM _TDAItem 
+WHERE UserId = 1 
+ORDER BY UpdateAt DESC 
+LIMIT 10 OFFSET 20;
+
+/* 3. 내가 생성한 상품의 총 개수 */
+SELECT COUNT(*) FROM _TDAItem 
+WHERE UserId = 1;
+
+/* 4. 내가 좋아요 누른 상품 조회 (3페이지) */
+SELECT i.* FROM _TDAItem i
+JOIN _TDAItemFavorite f ON i.ItemId = f.ItemId
+WHERE f.UserId = 1
+ORDER BY f.CreateAt DESC
+LIMIT 10 OFFSET 20;
+
+/* 5. 내가 좋아요 누른 상품의 총 개수 */
+SELECT COUNT(*) FROM _TDAItemFavorite 
+WHERE UserId = 1;
+
+/* 6. 상품 생성 */
+INSERT INTO _TDAItem (UserId, ItemName, ItemImage, ItemRemark, Price)
+VALUES (1, '새 상품', 'image_url', '상품 설명입니다.', 50000);
+
+/* 7. 상품 목록 조회 ("test" 포함, 좋아요 개수 포함, 1페이지) */
+SELECT i.*, 
+       (SELECT COUNT(*) FROM _TDAItemFavorite f WHERE f.ItemId = i.ItemId) AS FavoriteCount
+FROM _TDAItem i
+WHERE i.ItemName LIKE '%test%'
+ORDER BY i.UpdateAt DESC
+LIMIT 10 OFFSET 0;
+
+/* 8. 상품 상세 조회 (1번 상품) */
+SELECT * FROM _TDAItem WHERE ItemId = 1;
+
+/* 9. 상품 정보 수정 (1번 상품) */
+UPDATE _TDAItem 
+SET ItemName = '수정된 상품명', Price = 45000, UpdateAt = NOW() 
+WHERE ItemId = 1;
+
+/* 10. 상품 삭제 (1번 상품) */
+DELETE FROM _TDAItem WHERE ItemId = 1;
+
+/* 11. 상품 좋아요 (1번 유저가 2번 상품 좋아요) */
+INSERT INTO _TDAItemFavorite (UserId, ItemId) VALUES (1, 2);
+
+/* 12. 상품 좋아요 취소 */
+DELETE FROM _TDAItemFavorite WHERE UserId = 1 AND ItemId = 2;
+
+/* 13. 상품 댓글 작성 */
+INSERT INTO _TDAItemComment (ItemId, UserId, CommentText) 
+VALUES (2, 1, '이 상품 아직 팔렸나요?');
+
+/* 14. 상품 댓글 조회 (특정 날짜 이전 데이터 10개) */
+SELECT * FROM _TDAItemComment 
+WHERE ItemId = 1 AND CreateAt < '2025-03-25'
+ORDER BY CreateAt DESC
+LIMIT 10;
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diff --git a/schema.sql b/schema.sql
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+++ b/schema.sql
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+-- 1. 유저 테이블
+CREATE TABLE _TDAUser (
+    UserId SERIAL PRIMARY KEY,
+    Email VARCHAR(255) UNIQUE NOT NULL,
+    Password VARCHAR(255) NOT NULL,
+    UserName VARCHAR(50) NOT NULL,
+    CreateAt TIMESTAMP DEFAULT NOW()
+);
+
+-- 2. 태그 마스터 테이블
+CREATE TABLE _TDATag (
+    TagId SERIAL PRIMARY KEY,
+    TagName VARCHAR(50) UNIQUE NOT NULL
+);
+
+-- 3. 상품 테이블
+CREATE TABLE _TDAItem (
+    ItemId SERIAL PRIMARY KEY,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    ItemName VARCHAR(255) NOT NULL,
+    ItemImage TEXT,
+    ItemRemark TEXT,
+    Price INTEGER NOT NULL DEFAULT 0,
+    IsClosed BOOLEAN DEFAULT FALSE,
+    IsCompleted BOOLEAN DEFAULT FALSE,
+    UpdateAt TIMESTAMP DEFAULT NOW()
+);
+
+-- 4. 상품 문의(댓글) 테이블
+CREATE TABLE _TDAItemComment (
+    ItemId INTEGER REFERENCES _TDAItem(ItemId) ON DELETE CASCADE,
+    Serl SERIAL,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    CommentText TEXT NOT NULL,
+    CreateAt TIMESTAMP DEFAULT NOW(),
+    UpdateAt TIMESTAMP DEFAULT NOW(),
+    PRIMARY KEY (ItemId, Serl)
+);
+
+-- 5. 상품 찜하기 테이블
+CREATE TABLE _TDAItemFavorite (
+    ItemId INTEGER REFERENCES _TDAItem(ItemId) ON DELETE CASCADE,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    CreateAt TIMESTAMP DEFAULT NOW(),
+    PRIMARY KEY (ItemId, UserId)
+);
+
+-- 6. 상품 태그 연결 테이블
+CREATE TABLE _TDAItemTag (
+    ItemId INTEGER REFERENCES _TDAItem(ItemId) ON DELETE CASCADE,
+    TagId INTEGER REFERENCES _TDATag(TagId) ON DELETE CASCADE,
+    PRIMARY KEY (ItemId, TagId)
+);
+
+-- 7. 게시판 테이블
+CREATE TABLE _TDABoard (
+    BoardId SERIAL PRIMARY KEY,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    BoardTitle VARCHAR(255) NOT NULL,
+    BoardContents TEXT NOT NULL,
+    BoardImage TEXT,
+    CreateAt TIMESTAMP DEFAULT NOW(),
+    UpdateAt TIMESTAMP DEFAULT NOW()
+);
+
+-- 8. 게시판 댓글 테이블
+CREATE TABLE _TDABoardComment (
+    BoardId INTEGER REFERENCES _TDABoard(BoardId) ON DELETE CASCADE,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    Serl SERIAL,
+    CommentContents TEXT NOT NULL,
+    CreateAt TIMESTAMP DEFAULT NOW(),
+    UpdateAt TIMESTAMP DEFAULT NOW(),
+    PRIMARY KEY (BoardId, Serl)
+);
+
+-- 9. 게시판 좋아요 테이블
+CREATE TABLE _TDABoardLike (
+    BoardId INTEGER REFERENCES _TDABoard(BoardId) ON DELETE CASCADE,
+    UserId INTEGER REFERENCES _TDAUser(UserId) ON DELETE CASCADE,
+    CreateAt TIMESTAMP DEFAULT NOW(),
+    PRIMARY KEY (BoardId, UserId)
+);
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diff --git a/sprint-mission-6.sql b/sprint-mission-6.sql
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--- /dev/null
+++ b/sprint-mission-6.sql
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+-- 1. 모든 주문 조회
+SELECT * FROM orders;
+
+-- 2. id가 423인 주문 조회
+SELECT * FROM orders WHERE id = 423;
+
+-- 3. 총 주문 건수 구하기
+SELECT COUNT(*) AS total_orders FROM orders;
+
+-- 4. 최신 순으로 주문 조회 (날짜와 시간 기준)
+SELECT * FROM orders ORDER BY date DESC, time DESC;
+
+-- 5. 오프셋 기반 페이지네이션 (1페이지, 10개)
+SELECT * FROM orders ORDER BY date DESC, time DESC LIMIT 10 OFFSET 0;
+
+-- 6. 오프셋 기반 페이지네이션 (5페이지, 10개)
+SELECT * FROM orders ORDER BY date DESC, time DESC LIMIT 10 OFFSET 40;
+
+-- 7. 커서 기반 페이지네이션 (id 42 기준 다음 페이지)
+SELECT * FROM orders WHERE id < 42 ORDER BY id DESC LIMIT 10;
+
+-- 8. 2025년 3월 주문 내역 조회
+SELECT * FROM orders WHERE date >= '2025-03-01' AND date <= '2025-03-31';
+
+-- 9. 2025년 3월 12일 오전 주문 내역 조회
+SELECT * FROM orders WHERE date = '2025-03-12' AND time < '12:00:00';
+
+-- 10. 이름에 'Cheese' 혹은 'Chicken'이 포함된 피자 종류 조회
+SELECT * FROM pizza_types WHERE name LIKE '%Cheese%' OR name LIKE '%Chicken%';
+
+-- 11. 각 피자별 주문된 건 수
+SELECT pizza_id, COUNT(DISTINCT order_id) FROM order_details GROUP BY pizza_id;
+
+-- 12. 각 피자별 총 주문 수량
+SELECT pizza_id, SUM(quantity) FROM order_details GROUP BY pizza_id;
+
+-- 13. 가격이 20보다 큰 피자 종류만 order_details에서 조회
+SELECT * FROM order_details 
+WHERE pizza_id IN (SELECT id FROM pizzas WHERE price > 20);
+
+-- 14. 날짜별 총 주문 건수 80건 이상인 날 조회 및 정렬
+SELECT date, COUNT(id) AS order_count FROM orders 
+GROUP BY date HAVING COUNT(id) >= 80 ORDER BY order_count DESC;
+
+-- 15. 총 주문 수량 10개 이상인 피자 조회 및 내림차순 정렬
+SELECT pizza_id, SUM(quantity) AS total_qty FROM order_details 
+GROUP BY pizza_id HAVING SUM(quantity) >= 10 ORDER BY total_qty DESC;
+
+-- 16. 피자별 총 수익 구하기
+SELECT od.pizza_id, SUM(od.quantity * p.price) AS total_revenue 
+FROM order_details od JOIN pizzas p ON od.pizza_id = p.id GROUP BY od.pizza_id;
+
+-- 17. 날짜별 주문 건수와 총 주문 수량
+SELECT o.date, COUNT(DISTINCT o.id) AS order_count, SUM(od.quantity) AS total_quantity 
+FROM orders o JOIN order_details od ON
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