I am new to coding.
I am trying to get output from deducting one column from another in one table.
The result/output I get is used to update another column in the table.

code
import sqlite3

ebook = sqlite3.connect(‘bookstore.db’)
cursor = ebook.cursor()

mar_results = ”’SELECT ts_sp, ts_pp,(ts_sp – ts_pp) AS mar_rusults FROM book WHERE b_id = 3001”’
cursor.execute(mar_results,)
mar_results = cursor.fetchall()

cursor.execute(”’UPDATE book SET ts_margin = ? WHERE b_id = 3001 ”’, (margin_results,))

ebook.commit()

what I expected to see is the 54.0 in the TS_margin column:
ts_sp ts_pp ts_margin
139.0 85.0 54.0

I am getting the below error:
cursor.execute(”’UPDATE book SET ts_margin = ? WHERE b_id = 3001 ”’, (margin_results,))
sqlite3.ProgrammingError: Error binding parameter 1: type ‘tuple’ is not supported

Thanks in advance for the help