mysql返回错误

-- 错误的SQL语句
SELECT * FORM users;

-- 正确的SQL语句
SELECT * FROM users;

# 错误信息
ERROR 2003 (HY000): Can't connect to MySQL server on 'localhost' (10061)

# 解决方法
# 确保MySQL服务器正在运行
sudo systemctl start mysql

-- 错误信息
ERROR 1045 (28000): Access denied for user 'testuser'@'localhost' (using password: YES)

-- 解决方法
-- 授予用户权限
GRANT ALL PRIVILEGES ON *.* TO 'testuser'@'localhost' IDENTIFIED BY 'password';
FLUSH PRIVILEGES;

-- 错误信息
ERROR 1030 (HY000): Got error 28 from storage engine

-- 解决方法
-- 检查磁盘空间并清理不必要的文件
df -h
rm -rf /path/to/large/directory

-- 错误信息
ERROR 1062 (23000): Duplicate entry '1' for key 'PRIMARY'

-- 解决方法
-- 检查并修正数据
DELETE FROM users WHERE id = 1;
INSERT INTO users (id, name) VALUES (1, 'John Doe');