NULL Value in sql | Part 10 | SQL tutorial for beginners | Tech Talk Tricks

Welcome to our Tech Talk Tricks channel.The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank.
#TechTalkTricks #RanaSingh

A field with a NULL value is a field with no value. It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.

Syntax
The basic syntax of NULL while creating a table.

SQL: CREATE TABLE CUSTOMERS(
ID INT NOT NULL,
NAME VARCHAR (20) NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR (25),
SALARY DECIMAL (18, 2),
PRIMARY KEY (ID)
);
Here, NOT NULL signifies that column should always accept an explicit value of the given data type. There are two columns where we did not use NOT NULL, which means these columns could be NULL.

A field with a NULL value is the one that has been left blank during the record creation.
null value definition

sql is null or empty

sql is not null or empty

null value statistics

importance of null values in relational database

sql if null

sql isnull function

sql if not null
**************************************************
Follow Tech Talk Trick on Facebook
https://www.facebook.com/techtalktricks
**************************************************
Follow tech talk trick on Twitter
https://twitter.com/tecktalktrick
**************************************************
Follow Tech Talk Tricks on Instagram
https://www.instagram.com/techtalktricks
**************************************************
Subscribe tech talk tricks on YouTube
https://www.youtube.com/techtalktricks
***************************************************