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SQL2
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SQL2
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DROP TABLE t_product;
CREATE TABLE t_product(
iproduct INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
nm VARCHAR(10) NOT NULL,
price INT(6) zerofill NOT NULL,
company VARCHAR(12) NOT NULL
);
INSERT INTO t_product
(nm, price, company)
VALUES
('맥북 프로', '5000000', 'apple');
INSERT INTO t_product
(iproduct, nm, price, company)
VALUES
(2, '갤럭시S21', 1500000, 'samsung'),
(3, '버즈', 3000, 'samsung'),
(4, '에어팟', 400, 'apple');
UPDATE t_product
SET nm = '버즈 프로'
, price = 250000
WHERE iproduct = 3;
UPDATE t_product
SET company = '삼성'
WHERE company = 'samsung';
WHERE iproduct IN (2, 3);
WHERE iproduct = 2 OR iproduct = 3;
DELETE FROM t_product
WHERE iproduct = 4;
SELECT iproduct, nm, price, company
FROM t_product;
SELECT COUNT(nm), SUM(price), AVG(price)
, SUM(price) / COUNT(price)
, MAX(price), MIN(price)
FROM t_product;
SELECT company, COUNT(nm), SUM(price), AVG(price)
, SUM(price) / COUNT(price)
, MAX(price), MIN(price)
FROM t_product
GROUP BY company
HAVING SUM(price)>2000000;
-- 외부에서 root 계정 접속 가능 체크
-- UTF8 꼭 체크
-- koreait
-- 3308
-- java, sql, Android, JSP, HTML, CSS, Javascript