如何在 MySQL 中设置初始值和自动增量?

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时间:2020-08-31 14:11:14  来源:igfitidea点击:

How to set initial value and auto increment in MySQL?

mysqlinsertauto-increment

提问by bbtang

How do I set the initial value for an "id" column in a MySQL table that start from 1001?

如何为从 1001 开始的 MySQL 表中的“id”列设置初始值?

I want to do an insert "INSERT INTO users (name, email) VALUES ('{$name}', '{$email}')";

我想做一个插入 "INSERT INTO users (name, email) VALUES ('{$name}', '{$email}')";

Without specifying the initial value for the id column.

不指定 id 列的初始值。

回答by Anatoliy

Use this:

用这个:

ALTER TABLE users AUTO_INCREMENT=1001;

or if you haven't already added an id column, also add it

或者如果您还没有添加 id 列,也添加它

ALTER TABLE users ADD id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ADD INDEX (id);

回答by Eric Leschinski

MySQL - Setup an auto-incrementing primary key that starts at 1001:

MySQL - 设置一个从 1001 开始的自动递增主键:

Step 1, create your table:

第 1 步,创建您的表:

create table penguins(
  my_id       int(16) auto_increment, 
  skipper     varchar(4000),
  PRIMARY KEY (my_id)
)

Step 2, set the start number for auto increment primary key:

第二步,设置自增主键的起始编号:

ALTER TABLE penguins AUTO_INCREMENT=1001;

Step 3, insert some rows:

第 3 步,插入一些行:

insert into penguins (skipper) values("We need more power!");
insert into penguins (skipper) values("Time to fire up");
insert into penguins (skipper) values("kowalski's nuclear reactor.");

Step 4, interpret the output:

第 4 步,解释输出:

select * from penguins

prints:

印刷:

'1001', 'We need more power!'
'1002', 'Time to fire up'
'1003', 'kowalski\'s nuclear reactor'

回答by Bojan Hrnkas

MySQL Workbench

MySQL 工作台

If you want to avoid writing sql, you can also do it in MySQL Workbench by right clicking on the table, choose "Alter Table ..." in the menu.

如果你想避免写sql,也可以在MySQL Workbench中通过右键单击表,在菜单中选择“Alter Table ...”来完成。

When the table structure view opens, go to tab "Options" (on the lower bottom of the view), and set "Auto Increment" field to the value of the next autoincrement number.

当表结构视图打开时,转到选项卡“选项”(在视图的底部),并将“自动增量”字段设置为下一个自动增量编号的值。

Don't forget to hit "Apply" when you are done with all changes.

完成所有更改后,不要忘记点击“应用”。

PhpMyAdmin:

PhpMyAdmin:

If you are using phpMyAdmin, you can click on the table in the lefthand navigation, go to the tab "Operations" and under Table Options change the AUTO_INCREMENT value and click OK.

如果您使用的是 phpMyAdmin,您可以单击左侧导航中的表格,转到“操作”选项卡,然后在“表格选项”下更改 AUTO_INCREMENT 值,然后单击“确定”。

回答by John

First you need to add column for auto increment

首先,您需要添加用于自动增量的列

alter table users add column id int(5) NOT NULL AUTO_INCREMENT FIRST

This query for add column at first. Now you have to reset auto increment initial value. So use this query

此查询首先添加列。现在您必须重置自动增量初始值。所以使用这个查询

alter table users AUTO_INCREMENT=1001

Now your table started with 1001

现在你的表以 1001 开头

回答by ospider

You could also set it in the create tablestatement.

您也可以在create table语句中设置它。

`CREATE TABLE(...) AUTO_INCREMENT=1000`

回答by Mostafa Fallah

Also , in PHPMyAdmin, you can select table from left side(list of tables) then do this by going there.
Operations Tab->Table Options->AUTO_INCREMENT.

Now, Set your values and then press Go under the Table Options Box.

此外,在PHPMyAdmin 中,您可以从左侧选择表格(表格列表),然后去那里执行此操作。
操作选项卡->表选项->AUTO_INCREMENT。

现在,设置您的值,然后在表选项框下Go

回答by Arun Kasyakar

For this you have to set AUTO_INCREMENTvalue

为此,您必须设置AUTO_INCREMENT

ALTER TABLE tablename AUTO_INCREMENT = <INITIAL_VALUE>

Example

例子

ALTER TABLE tablename AUTO_INCREMENT = 101

回答by Laxmikant Bhumkar

Alternatively, If you are too lazy to write the SQL query. Then this solution is for you. enter image description here

或者,如果您懒得编写 SQL 查询。那么这个解决方案适合你。 在此处输入图片说明

  1. Open phpMyAdmin
  2. Select desired Table
  3. Click on Operationstab
  4. Set your desired initial Value for AUTO_INCREMENT
  5. Done..!
  1. 打开phpMyAdmin
  2. 选择所需的
  3. 单击操作选项卡
  4. AUTO_INCREMENT设置所需的初始值
  5. 完毕..!