How To Resolve/Fix PostgreSQL Default Value Not Working || PostgreSQL Column Default Value | pgAdmin

Published: 28 August 2022
on channel: Knowledge 360

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Description
------------------

If you’re facing issues with PostgreSQL default values not working in your columns, this tutorial is here to help. Default values are a key feature in database management, ensuring that specific columns automatically populate with preset data when no value is provided. However, there are times when these default values might not function as expected, leading to potential data inconsistencies or application errors.

In this video, we explore the possible reasons why default values might not be applied in your PostgreSQL database, such as incorrect column definitions, conflicts with triggers, or issues within the pgAdmin interface. We provide a detailed, step-by-step guide to diagnosing and fixing these problems, ensuring that your default values are correctly implemented and operational.

We start by reviewing how to properly set default values in PostgreSQL, including using the SQL DEFAULT clause in table definitions. Then, we demonstrate common pitfalls that could prevent these defaults from working, along with practical solutions to resolve each issue. You'll also learn how to test and validate that the default values are working as intended after applying the fix.

Whether you’re a seasoned database administrator or a developer just getting started with PostgreSQL, this tutorial will equip you with the knowledge to troubleshoot and fix default value issues efficiently. By the end of the video, you'll have a clear understanding of how to manage default values in PostgreSQL, ensuring your database remains reliable and consistent.

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-- In this video, we will

-- Use A Default Value
-- Default Value Not Working
-- Alter Column With A Default Value
-- Alter Column Datatype

-- So, keep watching and subscribe to my channel

CREATE TABLE EMP(
ID NUMERIC,
NAME CHARACTER VARYING(20),
SALARY NUMERIC(10,2),
DEPTNO CHARACTER VARYING(10)
);

INSERT INTO EMP(id,name,salary,deptno)
values(1,'Akram',100.23,'10');

select * from emp;

-- Now, let's alter the table, and make Salary column default

Alter table emp alter column salary set default 50;

-- First I will show you when it works and then it won't work.

INSERT INTO EMP(id,name,deptno)
values(2,'Sohail','10');
-- This must have inserted salary as 50, which I have set default value.
-- Let's check

Select * from emp;

-- Now, I will show you when default value won't work

INSERT INTO EMP(id,name,salary,deptno)
values(3,'Knowledge 360',null,'15');

-- Here, the salary must be inserted as NULL

Select * from emp;

-- So, the conclusion is, whenever we give the default value, we do not
-- need to mention the column in the insert statement.
-- If we do so, then we have to put some value, even if it is null
-- The database will accept the null

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