python-mysqlHow can I use the "WHERE IN" clause in a MySQL query using Python?

The WHERE IN clause is a powerful clause used to filter the results of a query based on values in a specified list or subquery. This clause can be used in a MySQL query using Python by using the execute() method of the cursor object.

Here is an example of a MySQL query using Python with the WHERE IN clause:

import mysql.connector

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

mycursor = mydb.cursor()

sql = "SELECT * FROM customers WHERE address IN ('Valley 345', 'Park Lane 38')"

mycursor.execute(sql)

myresult = mycursor.fetchall()

for x in myresult:
  print(x)

This example will output the following:

('John', 'Doe', 'Park Lane 38')
('Mary', 'Moe', 'Valley 345')

The code can be broken down into the following parts:

1. import mysql.connector: This imports the mysql.connector module, which allows us to connect to a MySQL database.

2. mydb = mysql.connector.connect(): This creates a connection to the MySQL database.

3. mycursor = mydb.cursor(): This creates a cursor object, which allows us to execute SQL queries.

4. sql = "SELECT * FROM customers WHERE address IN ('Valley 345', 'Park Lane 38')": This is the SQL query that uses the WHERE IN clause to filter the results based on the specified list of addresses.

5. mycursor.execute(sql): This executes the SQL query.

6. myresult = mycursor.fetchall(): This fetches the results of the query and stores them in the myresult variable.

7. for x in myresult:: This is a for loop that iterates over each row in the myresult variable and prints the results.

Helpful links

• MySQL Connector/Python Developer Guide
• MySQL WHERE IN Clause

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