#1. at_mid, at_final, at_attend, at_hw 값 업데이트 (40, 40, 10, 10) UPDATE attend SET at_mid = 39, at_final = 39, at_attend = 2, at_hw = 9 WHERE at_num in (8, 18, 26); UPDATE attend SET at_mid = 16, at_final = 27, at_attend = 9, at_hw = 10 WHERE at_num in (7, 17, 27); UPDATE attend SET at_mid = 35, at_final = 35, at_attend = 9, at_hw = 9 WHERE at_num in (22, 23, 24); UPDATE attend SET at_mid = 25, at..

CREATE DATABASE university; USE university #학생테이블 생성 CREATE TABLE student ( st_num INT, st_name VARCHAR(20) NOT NULL, st_term INT DEFAULT 0, st_point INT DEFAULT 0, PRIMARY KEY (st_num) ); #교수테이블 생성 CREATE TABLE professor ( pr_num INT, pr_name VARCHAR(20) NOT NULL, pr_age INT NOT NULL, st_room VARCHAR(45), pr_state VARCHAR(45) DEFAULT "재직", pr_position VARCHAR(45) DEFAULT "조교수", PRIMARY KEY (pr_..

#1. F를 받은 학생 명단(학번, 이름, 학과) SELECT std_num AS "학번", std_name AS "이름", std_major AS "학과" FROM student JOIN attend ON std_num = at_std_num WHERE at_score = 'F'; #2. A학점을 받은 학생들의 (학번, 이름, 과목) => 테이블 3개 JOIN SELECT std_num AS "학번", std_name AS "이름", co_name AS "과목" FROM student JOIN attend ON std_num = at_std_num JOIN course ON co_code = at_co_code WHERE at_score = 'A'; /* 3. A학점을 받은 학생들의 (학번, 이름, 과..

# DB school CREATE DATABASE school; USE school # student 테이블 만들기 CREATE TABLE student ( std_num VARCHAR(10), std_name VARCHAR(20) NOT NULL, std_major VARCHAR(20), std_term INT, std_point INT, PRIMARY KEY(std_num)); # course 테이블 만들기 CREATE TABLE course ( co_code VARCHAR(11), co_name VARCHAR(20) NOT NULL, co_professor VARCHAR(20), co_point INT DEFAULT 3, co_time INT, co_timetable VARCHAR(40), PRIM..

#1. buy 테이블에서 customer의 이름을 홍0동으로 변경해서 출력만 SELECT REPLACE(customer, substr(customer, 2, 1), '0') AS "고객명" FROM buy; #2. product 테이블에서 price가 40000이상인 데이터만 상품명(할인상품)으로 표시하여 출력(조회만) SELECT num, type_a, type_b, IF(price>=40000, CONCAT(name, "(할인상품)"), name) AS 'name', price, amount, sale_amount, resgister_date FROM product; #3. 월별 매출합계 출력 SELECT MONTH(resgister_date) AS MONTH, SUM(sale_amount) AS "..