make a inner join to postgresql in python

To make an inner join to PostgreSQL in Python, we need to use the psycopg2 library. Here's an example code snippet:


main.py
import psycopg2

# Establish database connection
conn = psycopg2.connect(
    host="your_host",
    database="your_database",
    user="your_user",
    password="your_password"
)

# Open a cursor to perform database operations
cur = conn.cursor()

# Build the inner join query
query = "SELECT * FROM table1 INNER JOIN table2 ON table1.id=table2.table1_id"

# Execute the query
cur.execute(query)

# Fetch the results
results = cur.fetchall()

# Print the results
for row in results:
    print(row)

# Close the database connection and cursor
cur.close()
conn.close()
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In this example, we first connect to the database using the psycopg2.connect() method, passing in the necessary connection details. Then we open a cursor, which is used to execute queries and fetch results. We build the inner join query and execute it using the cur.execute() method, then fetch the results using the cur.fetchall() method. Finally, we print the results and close the cursor and database connection using cur.close() and conn.close(), respectively.

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