How to display variable values ​​from BD?

Question

Python

There is a database, it has a table "cmd" column "num_chat", how can I display the value from this column?
(in the table not only this variable)
my bad code is:

import sqlite3

conn = sqlite3.connect("DataBasa.db")
print('DataBasa подключена!')
c = conn.cursor()

a = 0
c.execute("SELECT * FROM cmd WHERE num_chat = %d" % (a))
b = c.fetchall()

Answer 1

Go and learn to find all the required information in the docks https://docs.python.org/3/library/sqlite3.html
Google is also worth learning

Answer 2

You DB show us.