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Python MySQL – Where Clause

  • Difficulty Level : Expert
  • Last Updated : 02 Jun, 2020

Where clause is used in MySQL database to filter the data as per the condition required. You can fetch, delete or update a particular set of data in MySQL database by using where clause.

Syntax

SELECT column1, column2, …. cloumnN FROM [TABLE NAME] WHERE [CONDITION];

The above syntax is used for displaying a certain set of data following the condition.

Example: Consider the following database named college and having a table name as a student.



Schema of the database:

python-db-schema
 
Database:

python-db-table
 

Where Clause In Python

Steps to use where clause in Python is:

  1. First form a connection between MySQL and Python program. It is done by importing mysql.connector package and using mysql.connector.connect() method, for passing the user name, password, host (optional default: localhost) and, database (optional) as parameters to it.
  2. Now, create a cursor object on the connection object created above by using cursor() method. A database cursor is a control structure that enables traversal over the records in a database.
  3. Then, execute the where clause statement by passing it through execute() method.




import mysql.connector
   
#Establishing connection
conn = mysql.connector.connect(user='your_username',
                               host='localhost',
                               password ='your_password',
                               database='College')
   
# Creating a cursor object using 
# the cursor() method
mycursor = conn.cursor();
   
# SQL Query
sql = "select * from Student where Roll_no >= 3;"
   
# Executing query
mycursor.execute(sql)
   
myresult = mycursor.fetchall()
   
for x in myresult:
    print(x)
  
# Closing the connection
conn.close()

OUTPUT:

python-where-mysql

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