THE WORLD'S LARGEST WEB DEVELOPER SITE

Python MySQL Create Table


Creating a Table

To create a table in MySQL, use the "CREATE TABLE" statement.

Make sure you define the name of the database when you create the connection

Example

create a datebase named "mydatabase":

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  passwd="yourpassword",
  database: "mydatabase"
)

mycursor = mydb.cursor()

mycursor.execute("CREATE TABLE customers (name VARCHAR(255), address VARCHAR(255))")
Run example »

If the above code was executed with no errors, you have now successfully created a table.


Check if Table Exists

You can check if a database exist by listing all tables in your database by using the "SHOW TABLES" statement:

Example

Return a list of your system's databases:

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  passwd="yourpassword",
  database: "mydatabase"
)

mycursor = mydb.cursor()

mycursor.execute("SHOW TABLES")

for x in mycursor:
  print(x)
Run example »

Primary Key

When creating a table, you should also create a column with a unique key for each record.

This can be done by defining a PRIMARY KEY.

We use the statement "INT AUTO_INCREMENT PRIMARY KEY" which will insert a unique number for each record. Starting at 1, and increased by one for each record.

Example

Create primary key when creating the table:

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  passwd="yourpassword",
  database: "mydatabase"
)

mycursor = mydb.cursor()

mycursor.execute(sql = "CREATE TABLE customers (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255), address VARCHAR(255))")
Run example »

If the table already exists, use the ALTER TABLE keyword:

Example

Create primary key on an existing table:

import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="yourusername",
  passwd="yourpassword",
  database: "mydatabase"
)

mycursor = mydb.cursor()

mycursor.execute("ALTER TABLE customers ADD COLUMN id INT AUTO INCREMENT PRIMARY KEY")
Run example »