IS NOT NULL Operator
The IS NOT NULL Operator in PostgreSQL is a simple and powerful way to retrieve data without the NULL values in a specified column. Using “IS NOT NULL” in the SELECT statement’s WHERE clause allows you to remove all rows containing NULL value in the specified column.
Syntax:
SELECT column1, column2
FROM table_name
WHERE column_name IS NOT NULL;
In this query, only rows where the ‘column_name‘ is not NULL will be included in the result set. This method ensures that only non-NULL values are retrieved from the specified column.
Retrieving Data Without NULL in a Certain Column
PostgreSQL is an advanced relational database system that supports both relational (SQL) and non-relational (JSON) queries. It is free and open-source. Null values in a database field can have a negative effect on data analysis, query results, and application logic.
In PostgreSQL, NULL is used to denote missing values or unknown states, which might at times complicate the way of queries and analysis. The handling of NULL values is particularly important when working with PostgreSQL for null values retrieving even from specific columns should not be included. This article explores various methods to achieve this objective.