mysql two column combination unique

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1CREATE TABLE `content_html` (
2  `id` int(11) NOT NULL AUTO_INCREMENT,
3  `id_box_elements` int(11) DEFAULT NULL,
4  `id_router` int(11) DEFAULT NULL,
5  `content` mediumtext COLLATE utf8_czech_ci NOT NULL,
6  PRIMARY KEY (`id`),
7  UNIQUE KEY `id_box_elements` (`id_box_elements`,`id_router`)
8);

1CREATE TABLE IF NOT EXISTS cliente (
2	id bigint primary key auto_increment,
3    nome varchar(100) not null,
4    email varchar(100) not null unique,
5    senha varchar(255) not null,
6    documento varchar(50) not null unique,
7    dataCadastro date not null
8) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;

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