Python SQL Select Statement 3

Python SQL Select Statement

In this section, we explain to you how to write a SQL Select Statement in the Python Programming language. And how to extract or select the records from a Table. 

Before we get into the Select statement example, let me show you the data we will use.

Source Table 1

Python SQL Select statement Example

In this example, we show how to use the select statement to select records from a Table.

Please refer to Connect to Server article to understand the steps involved in establishing a connection in Python. The following are a few of the operations we can do on SQL Server but are not limited to them.

  1. Create Database
  2. Select Sorted Table Records
  3. Top 10 records
  4. Where Clause
# Example
import pyodbc
conn = pyodbc.connect("Driver={SQL Server Native Client 11.0};"
                      "Server=PRASAD;"
                      "Database=SQL Tutorial;"
                      "Trusted_Connection=yes;")

cursor = conn.cursor()
cursor.execute('SELECT * FROM CustomerSale')

for row in cursor:
    print('row = %r' % (row,))
Python SQL Select Statement Example 2

First, we imported or selected data from the Customer Sales table present in SQL Tutorial Database.

cursor = cursor.execute('SELECT * FROM CustomerSale')

Next, we used the For loop to iterate each row present in the Customer Sales table. Within the For Loop, we used the print statement to print rows.

for row in cursor:
    print('row = %r' % (row,))

Python SQL Select statement Example 2

Instead of selecting all the unnecessary columns (using * ), you can select the required columns.

This example selects the Employee Id, Occupation, Yearly Income, and Sales columns from the Customer Sales table.

# Example
import pyodbc
conn = pyodbc.connect("Driver={SQL Server Native Client 11.0};"
                      "Server=PRASAD;"
                      "Database=SQL Tutorial;"
                      "Trusted_Connection=yes;")

cursor = conn.cursor()
cursor.execute('SELECT EmpID, Occupation, YearlyIncome, Sales FROM CustomerSale')

for row in cursor:
    print('row = %r' % (row,))
Select Example 3

Select Database records Example 3

The cursor has many functions. You can use these Python cursor functions to alter the result provided by the select statement.

Cursor Functions 4

For example, the Python fetchone function fetches only one row or record from a table

# Example
import pyodbc
conn = pyodbc.connect("Driver={SQL Server Native Client 11.0};"
                      "Server=PRASAD;"
                      "Database=SQL Tutorial;"
                      "Trusted_Connection=yes;")

cursor = conn.cursor()
cursor.execute('SELECT * FROM CustomerSale')
result = cursor.fetchone()
print(result)
Cursor Example 5