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PostgreSQL - LIMIT with OFFSET clause

Python PostgreSQL - Limit Clause

Last Updated : 17 Feb, 2023

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In this article, we are going to see how to use the limit clause in PostgreSQL using pyscopg2 module in Python. In PostgreSQL LIMIT constraints the number of rows returned by the query. By default, It is used to display some specific number of rows from the top. If we want to skip a number of rows before returning the rows then we use the OFFSET clause after the LIMIT clause.

Syntax without using OFFSET: SELECT select_list FROM table_name LIMIT no_of_rows;

Syntax with using OFFSET: SELECT select_list FROM table_name LIMIT no_of_rows OFFSET rows_to_skip;

Table Used:

Here, we are using the product table for demonstration.

Now let's use the limit in this table, for we will use will psycopg2 module to connect the PostgreSQL and execute the SQL query in the cursor.execute(query) object.

Syntax: cursor.execute(sql_query);

Example 1: Using a limit clause in Postgre using Python

Python3

# importing psycopg2 import psycopg2  conn=psycopg2.connect(     database="geeks",     user="postgre",     password="root",     host="localhost",     port="5432" )  # Creating a cursor object using the cursor() method cursor = conn.cursor()  print("\ndisplaying five rows from top"); sql = '''SELECT * from products LIMIT 5 '''  # Executing the query cursor.execute(sql)  # Fetching the data result = cursor.fetchall(); print(result)  # Commit changes in the database conn.commit()  # Closing the connection conn.close()

Output:

Postgre limit clause

Example 2: Using limit and offset clause in Postgre using Python

Python3

# importing psycopg2 import psycopg2  conn=psycopg2.connect(     database="geeks",     user="postgre",     password="root",     host="localhost",     port="5432" )  # Creating a cursor object using the cursor() method cursor = conn.cursor() print("displaying four rows after a particular offset"); sql1 = '''SELECT * from products LIMIT 4 OFFSET 5 '''  # Executing the query cursor.execute(sql1)  # Fetching the data result1 = cursor.fetchall(); print(result1)   # Commit changes in the database conn.commit()  # Closing the connection conn.close()

Output:

Postgre limit clause with offset

PostgreSQL - LIMIT with OFFSET clause

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