mysql set field unique
ALTER TABLE mytbl ADD UNIQUE (columnName);mysql set field unique
ALTER TABLE mytbl ADD UNIQUE (columnName);mysql alter table set column unique
ALTER TABLE contacts
ADD CONSTRAINT contacts_unique UNIQUE (reference_number);mysql unique two columns
CREATE TABLE IF NOT EXISTS cliente (
id bigint primary key auto_increment,
nome varchar(100) not null,
email varchar(100) not null unique,
senha varchar(255) not null,
documento varchar(50) not null unique,
dataCadastro date not null
) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;Copyright © 2021 Codeinu
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