{"id":178,"date":"2024-06-15T09:03:11","date_gmt":"2024-06-15T01:03:11","guid":{"rendered":"http:\/\/zhaoyanqi.cn\/?p=178"},"modified":"2024-06-19T22:14:04","modified_gmt":"2024-06-19T14:14:04","slug":"mysql%e5%b8%b8%e7%94%a8%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/zhaoyanqi.cn\/?p=178","title":{"rendered":"Mysql\u5e38\u7528\u547d\u4ee4\uff08\u7b80\u5355\u7248\uff09"},"content":{"rendered":"\n

1. \u8fde\u63a5\u548c\u9000\u51fa<\/h3>\n\n\n\n

\u8fde\u63a5\u5230 MySQL<\/h4>\n\n\n\n
mysql -u root -p<\/code><\/pre>\n\n\n\n
\u9000\u51fa MySQL<\/h4>\n\n\n\n
EXIT;<\/code><\/pre>\n\n\n\n
2. \u6570\u636e\u5e93\u64cd\u4f5c<\/h3>\n\n\n\n
\u663e\u793a\u6240\u6709\u6570\u636e\u5e93<\/h4>\n\n\n\n
SHOW DATABASES;<\/code><\/pre>\n\n\n\n
\u521b\u5efa\u6570\u636e\u5e93<\/h4>\n\n\n\n
CREATE DATABASE test_db;<\/code><\/pre>\n\n\n\n
\u5220\u9664\u6570\u636e\u5e93<\/h4>\n\n\n\n
DROP DATABASE test_db;<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u6570\u636e\u5e93<\/h4>\n\n\n\n
USE test_db;<\/code><\/pre>\n\n\n\n
\u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93<\/h4>\n\n\n\n
SELECT DATABASE();<\/code><\/pre>\n\n\n\n
3. \u8868\u64cd\u4f5c<\/h3>\n\n\n\n
\u663e\u793a\u6240\u6709\u8868<\/h4>\n\n\n\n
SHOW TABLES;<\/code><\/pre>\n\n\n\n
\u521b\u5efa\u8868<\/h4>\n\n\n\n
CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(255) NOT NULL,\n    email VARCHAR(255) NOT NULL,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n) ENGINE=InnoDB;<\/code><\/pre>\n\n\n\n
\u5220\u9664\u8868<\/h4>\n\n\n\n
DROP TABLE users;<\/code><\/pre>\n\n\n\n
\u67e5\u770b\u8868\u7ed3\u6784<\/h4>\n\n\n\n
DESCRIBE users;<\/code><\/pre>\n\n\n\n
\u4fee\u6539\u8868\u7ed3\u6784<\/h4>\n\n\n\n
\u6dfb\u52a0\u65b0\u5217<\/h5>\n\n\n\n
ALTER TABLE users ADD age INT;<\/code><\/pre>\n\n\n\n
\u4fee\u6539\u5217\u6570\u636e\u7c7b\u578b<\/h5>\n\n\n\n
ALTER TABLE users MODIFY age SMALLINT;<\/code><\/pre>\n\n\n\n
\u91cd\u547d\u540d\u5217<\/h5>\n\n\n\n
ALTER TABLE users CHANGE age user_age INT;<\/code><\/pre>\n\n\n\n
\u5220\u9664\u5217<\/h5>\n\n\n\n
ALTER TABLE users DROP COLUMN user_age;<\/code><\/pre>\n\n\n\n
\u590d\u5236\u8868\u7ed3\u6784\u548c\u6570\u636e<\/h4>\n\n\n\n
\u590d\u5236\u8868\u7ed3\u6784<\/h5>\n\n\n\n
CREATE TABLE users_backup LIKE users;<\/code><\/pre>\n\n\n\n
\u590d\u5236\u8868\u6570\u636e<\/h5>\n\n\n\n
INSERT INTO users_backup SELECT * FROM users;<\/code><\/pre>\n\n\n\n
4. \u6570\u636e\u64cd\u4f5c<\/h3>\n\n\n\n
\u63d2\u5165\u6570\u636e<\/h4>\n\n\n\n
INSERT INTO users (username, email) VALUES ('Alice', 'alice@example.com');\nINSERT INTO users (username, email) VALUES ('Bob', 'bob@example.com');<\/code><\/pre>\n\n\n\n
\u6279\u91cf\u63d2\u5165\u6570\u636e<\/h4>\n\n\n\n
INSERT INTO users (username, email) VALUES \n('Charlie', 'charlie@example.com'),\n('David', 'david@example.com'),\n('Eve', 'eve@example.com');<\/code><\/pre>\n\n\n\n
\u66f4\u65b0\u6570\u636e<\/h4>\n\n\n\n
\u66f4\u65b0\u5355\u6761\u8bb0\u5f55<\/h5>\n\n\n\n
UPDATE users SET email = 'alice_new@example.com' WHERE username = 'Alice';<\/code><\/pre>\n\n\n\n
\u66f4\u65b0\u591a\u6761\u8bb0\u5f55<\/h5>\n\n\n\n
UPDATE users SET email = CONCAT(username, '@example.com') WHERE email LIKE '%@oldexample.com';<\/code><\/pre>\n\n\n\n
\u5220\u9664\u6570\u636e<\/h4>\n\n\n\n
\u5220\u9664\u5355\u6761\u8bb0\u5f55<\/h5>\n\n\n\n
DELETE FROM users WHERE username = 'Alice';<\/code><\/pre>\n\n\n\n
\u5220\u9664\u591a\u6761\u8bb0\u5f55<\/h5>\n\n\n\n
DELETE FROM users WHERE username IN ('Bob', 'Charlie');<\/code><\/pre>\n\n\n\n
\u6e05\u7a7a\u6240\u6709\u8bb0\u5f55<\/h5>\n\n\n\n
#\u65b9\u6cd5\u4e00\uff1a\u4e0d\u5efa\u8bae\u7528\u8fd9\u79cd\uff0c\u56e0\u4e3a\u4f1a\u5bfc\u81f4auto_increment\u4e0d\u7f6e0\uff0c\u518d\u63d2\u5165\u8bb0\u5f55\u4f1a\u6309\u7167\u4e4b\u524d\u7684\u987a\u5e8f\u589e\u52a0id\u53f7\nDELETE FROM users ; \n#\u65b9\u6cd5\u4e8c\uff1a\u4e00\u822c\u7528\u8fd9\u79cd\u65b9\u5f0f\ntruncate users ;<\/code><\/pre>\n\n\n\n
\u67e5\u8be2\u6570\u636e<\/h4>\n\n\n\n
\u67e5\u8be2\u6240\u6709\u6570\u636e<\/h5>\n\n\n\n
SELECT * FROM users;<\/code><\/pre>\n\n\n\n
\u67e5\u8be2\u7279\u5b9a\u5217<\/h5>\n\n\n\n
SELECT username, email FROM users;<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u6761\u4ef6\u67e5\u8be2<\/h5>\n\n\n\n
SELECT * FROM users WHERE username = 'David';<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u6a21\u7cca\u67e5\u8be2<\/h5>\n\n\n\n
SELECT * FROM users WHERE email LIKE '%@example.com';<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u6392\u5e8f<\/h5>\n\n\n\n
SELECT * FROM users ORDER BY created_at DESC;<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u5206\u9875<\/h5>\n\n\n\n
SELECT * FROM users LIMIT 5 OFFSET 10;<\/code><\/pre>\n\n\n\n
5. \u7528\u6237\u548c\u6743\u9650\u7ba1\u7406<\/h3>\n\n\n\n
\u521b\u5efa\u7528\u6237<\/h4>\n\n\n\n
CREATE USER 'new_user'@'localhost' IDENTIFIED BY 'password123';<\/code><\/pre>\n\n\n\n
\u5220\u9664\u7528\u6237<\/h4>\n\n\n\n
DROP USER 'new_user'@'localhost';<\/code><\/pre>\n\n\n\n
\u6388\u4e88\u6743\u9650<\/h4>\n\n\n\n
\u6388\u4e88\u5168\u90e8\u6743\u9650<\/h5>\n\n\n\n
GRANT ALL PRIVILEGES ON test_db.* TO 'new_user'@'localhost';<\/code><\/pre>\n\n\n\n
\u6388\u4e88\u7279\u5b9a\u6743\u9650<\/h5>\n\n\n\n
GRANT SELECT, INSERT, UPDATE ON test_db.* TO 'new_user'@'localhost';<\/code><\/pre>\n\n\n\n
\u64a4\u9500\u6743\u9650<\/h4>\n\n\n\n
REVOKE ALL PRIVILEGES ON test_db.* FROM 'new_user'@'localhost';<\/code><\/pre>\n\n\n\n
\u5237\u65b0\u6743\u9650<\/h4>\n\n\n\n
FLUSH PRIVILEGES;<\/code><\/pre>\n\n\n\n
6. \u5907\u4efd\u548c\u6062\u590d<\/h3>\n\n\n\n
\u5907\u4efd\u6570\u636e\u5e93<\/h4>\n\n\n\n
mysqldump -u root -p test_db > backup.sql<\/code><\/pre>\n\n\n\n
\u6062\u590d\u6570\u636e\u5e93<\/h4>\n\n\n\n
mysql -u root -p test_db < backup.sql<\/code><\/pre>\n\n\n\n
7. \u7cfb\u7edf\u547d\u4ee4<\/h3>\n\n\n\n
\u67e5\u770b MySQL \u670d\u52a1\u5668\u72b6\u6001<\/h4>\n\n\n\n
mysqladmin -u root -p status<\/code><\/pre>\n\n\n\n
\u542f\u52a8 MySQL \u670d\u52a1\u5668\uff08Linux\uff09<\/h4>\n\n\n\n
sudo systemctl start mysql<\/code><\/pre>\n\n\n\n
\u505c\u6b62 MySQL \u670d\u52a1\u5668\uff08Linux\uff09<\/h4>\n\n\n\n
sudo systemctl stop mysql<\/code><\/pre>\n\n\n\n
\u91cd\u542f MySQL \u670d\u52a1\u5668\uff08Linux\uff09<\/h4>\n\n\n\n
sudo systemctl restart mysql<\/code><\/pre>\n\n\n\n
8. \u5e38\u7528\u5feb\u6377\u547d\u4ee4<\/h3>\n\n\n\n
\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93<\/h4>\n\n\n\n
SELECT DATABASE();<\/code><\/pre>\n\n\n\n
\u67e5\u770b\u5f53\u524d\u7528\u6237<\/h4>\n\n\n\n
SELECT USER();<\/code><\/pre>\n\n\n\n
\u67e5\u770b MySQL \u7248\u672c<\/h4>\n\n\n\n
SELECT VERSION();<\/code><\/pre>\n\n\n\n
\u67e5\u770b\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4<\/h4>\n\n\n\n
SELECT NOW();<\/code><\/pre>\n\n\n\n
9. \u9ad8\u7ea7\u67e5\u8be2<\/h3>\n\n\n\n
\u805a\u5408\u51fd\u6570<\/h4>\n\n\n\n
\u8ba1\u6570<\/h5>\n\n\n\n
SELECT COUNT(*) FROM users;<\/code><\/pre>\n\n\n\n
\u6c42\u548c<\/h5>\n\n\n\n
SELECT SUM(age) FROM users;<\/code><\/pre>\n\n\n\n
\u5e73\u5747\u503c<\/h5>\n\n\n\n
SELECT AVG(age) FROM users;<\/code><\/pre>\n\n\n\n
\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c<\/h5>\n\n\n\n
SELECT MAX(age), MIN(age) FROM users;<\/code><\/pre>\n\n\n\n
\u5206\u7ec4\u67e5\u8be2<\/h4>\n\n\n\n
SELECT teacher_gender, COUNT(*) FROM teacher_info GROUP BY teacher_gender;<\/code><\/pre>\n\n\n\n
\u591a\u8868\u8fde\u63a5<\/h4>\n\n\n\n
\u5185\u8fde\u63a5<\/h5>\n\n\n\n
SELECT users.username, orders.order_id\nFROM users\nJOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n\n\n\n
\u5de6\u8fde\u63a5<\/h5>\n\n\n\n
SELECT users.username, orders.order_id\nFROM users\nLEFT JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n\n\n\n
\u53f3\u8fde\u63a5<\/h5>\n\n\n\n
SELECT users.username, orders.order_id\nFROM users\nRIGHT JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
1. \u8fde\u63a5\u548c\u9000\u51fa \u8fde\u63a5\u5230 MySQL \u9000\u51fa MySQL 2. \u6570\u636e\u5e93\u64cd\u4f5c \u663e\u793a\u6240\u6709\u6570\u636e\u5e93 \u521b\u5efa\u6570\u636e\u5e93 \u5220\u9664\u6570\u636e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,8],"tags":[],"class_list":["post-178","post","type-post","status-publish","format-standard","hentry","category-mysql_basic_management","category-mysql"],"_links":{"self":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=178"}],"version-history":[{"count":4,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/178\/revisions"}],"predecessor-version":[{"id":188,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/178\/revisions\/188"}],"wp:attachment":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}