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, …. columnN 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:
Database:
Where Clause In Python
Steps to use where clause in Python is:
- 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.
- 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.
- Then, execute the where clause statement by passing it through execute() method.
Python3
import mysql.connector #Establishing connectionconn = mysql.connector.connect(user='your_username', host='localhost', password ='your_password', database='College') # Creating a cursor object using # the cursor() methodmycursor = conn.cursor(); # SQL Querysql = "select * from Student where Roll_no >= 3;" # Executing querymycursor.execute(sql) myresult = mycursor.fetchall() for x in myresult: print(x)# Closing the connectionconn.close() |
OUTPUT:
