CREATE statement in MySQL





Hello and welcome everyone. In this article, we will learn about CREATE statement in MySQL. Let’s go.

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The MySQL CREATE statement is used to CREATE DATABASE and CREATE TABLE into the database.

CREATE DATABASE
You can use CREATE DATABASE command for creating the database in MySQL. The database will store your data in the table format. You can create one or more databases as well as one or more table in the database. When you create database default schema is applied.

Following are the syntax for create a database.

         CREATE DATABASE [ IF NOT EXISTS ] database_name;

CREATE DATABASE is a MySQL command for creating a database.
IF NOT EXISTS – In MySQL server having one or more database. If the database is present on MySQL server and you throw and command create database then it will throw an error, but if you use IF NOT EXIT clause then if the database is not present it will create database else it will not throw an error.
database_name – database name is the name given to the database to identify that the database on the server.


For example:
          CREATE DATABASE IF NOT EXISTS employee_DB;
NOTE: If you want to see all the database names that present in MySQL server, then you will use the following command:
          SHOW DATABASE;
It will show you created a database as well as all database names that present in MySQL server.

CREATE TABLE
You can use CREATE TABLE command for creating the table in MySQL server database. The table stores the data in the columns and rows format. You can create one or more table in the database. Mainly related information stored in row column-wise in the database, by looking just table you easily understand the data. There is no limit to creating a table in the database. Following three things required to create table command:
1.    The table name
2.    Field names
3.    Each field definitions.

Following are the syntax for create table.

         CREATE TABLE [ IF NOT EXISTS ] table_name (
                   column_name datatype (datatype_size) constraint_name
);

CREATE TABLE is a MySQL command for create table in the database.
IF NOT EXISTS – In the database having one or more table. If the table is present on the database and you throw and command create a table then it will throw an error, but if you use IF NOT EXIT clause then if the table is not present it will create table else it will not throw an error.
table_name – table name is the name given to the table to identify that the table in the database.
column_name – it is the name of the field.
datatype (datatype_size) – that is the datatype and datatype size defines the nature of the data to be stored in the field.
constraint_name - The constraint in MySQL is used to define rules to agree or limit what data can be stored in columns on a table.

For example:
          CREATE TABLE IF NOT EXISTS employee (
                   e_id int (10) PRIMARY KEY,
                   e_firstname varchar (50) NOT NULL,
                   e_lastname varchar (50) NOT NULL,
                   e_age int (10),
                   e_address varchar (250)
e_sex char (1)
e_phonenumber int (15) NOT NULL
)

Here is PRIMARY KEY is used to define a column as a primary key.
The NOT NULL constraint is being used for we do not want this field to be NULL.



NOTE: If you want to see all the tables that present in your database, then you will use the following command:
                   SHOW TABLE;
It will show you all the table names that present in your database.

NOTE: If you want to see the table structure that you are already created, then you will use the following command:
          DESCRIBE table_name;
It will show you the table structure that you give the table name.

In this article, we have learned to CREATE DATABASE and CREATE TABLE command with create a statement.

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