Python – Run SQL Server BLOG

Just an example for the same solution and results:

SELECT countries.local_name, lang_num
FROM countries,
  ( Select code, count(*) as lang_num
    From languages
    Group by code
    ) AS subquery
Where countries.code = subquery.code
Order by lang_num desc;

GO

SELECT  countries.local_name, count(*) AS lang_num
FROM countries
INNER JOIN languages
ON countries.code = languages.code
GROUP By languages.code, countries.local_name
ORDER BZ lang_num desc;

SELECT countries.local_name, lang_num

FROM countries,

( Select code, count(*) as lang_num

From languages

Group by code

) AS subquery

Where countries.code = subquery.code

Order by lang_num desc;

SELECT countries.local_name, count(*) AS lang_num

FROM countries

INNER JOIN languages

ON countries.code = languages.code

GROUP By languages.code, countries.local_name

ORDER BZ lang_num desc;

Install ODBC driver for MS SQL>
pip install pyodbc
Downloading pyodbc-4.0.30-cp39-cp39-win_amd64.whl (67 kB)
|████████████████████████████████| 67 kB 745 kB/s
Installing collected packages: pyodbc
Successfully installed pyodbc-4.0.30

Python query:

import pyodbc 
# Some other example server values are
# server = 'localhost\sqlexpress' # for a named instance
# server = 'myserver,port' # to specify an alternate port
server = 'tcp:192.168.0.13' 
database = 'AdventureWorks2017' 
username = 'dbuser' 
password = 'strongpassword' 
conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER='+server+';DATABASE='+database+';UID='+username+';PWD='+ password)
cursor = conn.cursor()
cursor.execute('SELECT  TOP(5) [FirstName]  ,[MiddleName]  ,[LastName] FROM [AdventureWorks2017].[Person].[Person]')
for row in cursor:
    print(row)

import pyodbc

# Some other example server values are

# server = 'localhost\sqlexpress' # for a named instance

# server = 'myserver,port' # to specify an alternate port

server = 'tcp:192.168.0.13'

database = 'AdventureWorks2017'

username = 'dbuser'

password = 'strongpassword'

conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER='+server+';DATABASE='+database+';UID='+username+';PWD='+ password)

cursor = conn.cursor()

cursor.execute('SELECT TOP(5) [FirstName] ,[MiddleName] ,[LastName] FROM [AdventureWorks2017].[Person].[Person]')

for row in cursor:

print(row)

Category: Python

Subquery inside FROM table VS JOIN

Python and MS SQL connection