IFNULL in PostgreSQL: Usage Guide

1 year ago
Noah Thompson
1 minute

In PostgreSQL, the ifnull function is used to determine if an expression is NULL. If it is NULL, it returns a specified replacement value, otherwise it returns the original value.

Here is the grammar:

IFNULL(expression, replace_value)

Explanation of Parameters:

  1. The expression to be evaluated.
  2. replace_value: the value to be returned if the expression is NULL.

I don’t understand what you mean.

Assuming there is a customers table with columns for id and name, where some rows in the name column are NULL.

SELECT id, IFNULL(name, 'No Name') AS customer_name
FROM customers;

The above query will return the id and name columns of each row in the customers table. If the value in the name column is NULL, it will return ‘No Name’, otherwise it will return the original name value.

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