How to generate mysql primary key id (self-increment, unique and irregular)

1. Use the uuid function to generate a unique and irregular primary key id
2. Automatic growth of id

1. Use the uuid function to generate a unique and irregular primary key id

sql:

CREATE TABLE `test` (
  `id` varchar(100) COLLATE utf8_estonian_ci NOT NULL COMMENT 'Unique and non-duplicate',
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `sex` int(11) DEFAULT NULL,
  `name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `major` int(255) DEFAULT NULL,
  `QQ` int(20) DEFAULT NULL,
  `introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;

surface:

Insert statement:

INSERT INTO test(id,sex,name,username,password,classes,major,QQ,introducemyself) VALUE(replace(uuid(), '-', ''),1,"小米","xck","001","班八",265,953190259,"我最牛");

Executed twice, generating two different ids:

2. Automatic growth of id

Change the type to integer and select auto-growth below

See DDL:

CREATE TABLE `test` (
  `id` bigint(100) NOT NULL AUTO_INCREMENT COMMENT 'unique and non-duplicate',
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `sex` int(11) DEFAULT NULL,
  `name` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `username` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `password` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `classes` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  `major` int(255) DEFAULT NULL,
  `QQ` int(20) DEFAULT NULL,
  `introducemyself` varchar(255) COLLATE utf8_estonian_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_estonian_ci ROW_FORMAT=DYNAMIC;

Insert a piece of data, sql:

INSERT INTO test(sex,name,username,password,classes,major,QQ,introducemyself) VALUE(1,"小米","xck","001","班八",265,953190259,"我最牛");

Corresponding database changes:

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