How to create data tables in a MySQL database

In a MySQL database, you can create a data table using the following steps:

Connect to a MySQL database.

Select the database for which you want to create the data table.

usecreate tablestatement to create a data table.

The specific steps are as follows:

1.Connect to a MySQL database.

You can use the following command to connect to a MySQL database:

mysql -u username -p password

-uSpecify a user name.

-pSpecify a password.

For example, connect to a file calledtestThe following command can be used:

mysql -u root -p 123456

You can use the following command to select the database for which you want to create a data table:

use database name

use test

create tableThe syntax of the statement is as follows:

Explain the create table table table name ( fieldname1 data type, fieldname2 data type, .,

Table nameis the name of the table you want to create.

The name of the fieldis the field name of the table.

Data typeis the data type of the field.

For example, create a file calledusersThe table containsidnamewithageThree fields, you can use the following commands:

Explain create table users ( id int, name varchar(255), age int); 

Here are some considerations for creating a datasheet:

Table names cannot contain spaces or special characters.

Field names can't contain spaces or special characters.

The data type must be a data type that is supported by MySQL.

Here are some advanced tips for creating data tables:

Specifies the default value for the field

Can be useddefaultThe keyword specifies the default value for the field. For example, willageThe default value for the field is set to 18, and you can use the following command:

Explain create table users ( id int, name varchar(255), age int default 18); 

You can use constraints to limit the value of a field. For example, willageThe value of a field is limited to between 18 and 100 and can be commanded using the following command:

Explain create table users ( id int, name varchar(255), age int check (age between 18 and 100)); 

The primary key is a unique identifier for a table. Can be usedprimary keyThe keyword specifies the primary key. For example, willidThe field is specified as the primary key, and the following command can be used:

Explain create table users ( id int primary key, name varchar(255), age int);