In a MySQL database, the where clause is used to filter the data according to the specified conditions. Using the where clause, you can retrieve, remove, or update a specific set of data in a MySQL database.
MySQL WHERE Clause in Python:
The WHERE clause has already been employed in one of our earlier tutorials:
- MySQL data update using Python
- MySQL data can be deleted using Python.
Use the WHERE clause in the SELECT statement to select data from a table based on a specific condition.
- Rows from the result set are typically filtered using the WHERE clause.
- Data from the MySQL Table can be retrieved, updated, and deleted with its assistance.
Following is the syntax of the WHERE clause −
SELECT column1, column2, columnN FROM table_name WHERE [condition]
Example: Consider the following database named college and have a table name as a student.
Schema of the database:
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 >= 21;" # Executing query mycursor.execute(sql) myresult = mycursor.fetchall() for x in myresult: print(x) # Closing the connection conn.close()
The where clause retrieves the records with roll number value greater than 21.
Note: also read about Drop Table Query – MySQL
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