mysql新建表怎么不成功

GRANT CREATE ON database_name.* TO 'username'@'host';

CREATE TABLE IF NOT EXISTS table_name (
    column1 datatype,
    column2 datatype,
    ...
);

CREATE TABLE table_name (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL
);

CREATE TABLE table_name (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL
) ENGINE=InnoDB;

CREATE TABLE table_name (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL
) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

CREATE TABLE parent_table (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL
);

CREATE TABLE child_table (
    id INT AUTO_INCREMENT PRIMARY KEY,
    parent_id INT,
    name VARCHAR(255) NOT NULL,
    FOREIGN KEY (parent_id) REFERENCES parent_table(id)
);

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    email VARCHAR(100) NOT NULL UNIQUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;