EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 360+ Courses All in One Bundle
  • Login

ISNULL SQL Server

By Roja MetlaRoja Metla

Home » Data Science » Data Science Tutorials » SQL Tutorial » ISNULL SQL Server

ISNULL SQL Server

Introduction to ISNULL SQL Server

ISNULL () function is used when you want a specific value that needs to be returned if the expression value is NULL. If the expression value will be returned then the expression value is not null. In this topic, we are going to learn about ISNULL SQL Server.

We get two arguments in the ISNULL () function. One is the expression and the other is value. Based on the expression it decides whether to return the expression value (if expression value is not null) or defined value (if expression value is null).

Start Your Free Data Science Course

Hadoop, Data Science, Statistics & others

Now in this session let us see the usage of ISNULL () function and find the example of the ISNULL () function.

Syntax: –

Below is the syntax for the ISNULL () function: –

isnull(<expression>,<value>); /* - - - -  ISNULL () SYNTAX - - - */

Based on the expression it decides whether to return the expression value (if expression value is not null) or defined value (if expression value is null).

Popular Course in this category
Sale
JDBC Training (6 Courses, 7+ Projects)6 Online Courses | 7 Hands-on Projects | 37+ Hours | Verifiable Certificate of Completion | Lifetime Access
4.5 (9,246 ratings)
Course Price

View Course

Related Courses
PHP Training (5 Courses, 3 Project)Windows 10 Training (4 Courses, 4+ Projects)SQL Training Program (7 Courses, 8+ Projects)PL SQL Training (4 Courses, 2+ Projects)Oracle Training (14 Courses, 8+ Projects)

How ISNULL in SQL Server Works?

Now let us see the usage of ISNULL () function in the SQL server.

select isnull('Hello','replace value of the NULL')AS "IS NULL";

Output:

isnull sql server output 1

Here the expression value is not NULL because of which the actual values is returned.

select isnull(NULL,'replace value of the NULL')AS "IS NULL";

Output:

isnull sql server output 2

Here the expression value is NULL because of which the replacement values is returned.

Now let us apply the ISNULL () function in a table.

Table creation: –

CREATE TABLE test_NULL
(
SERIAL_NO INT
,NAME VARCHAR(20)
,LOCATION VARCHAR(20)
, AGE INT
, OCCUPATION VARCHAR(20)
)

Now let us insert data into the table: –

INSERT INTO TEST_NULL VALUES (1,'Rose','USA', 24,'Software Engineer');
INSERT INTO TEST_NULL VALUES (2,'Rahul','India',NULL,'Artist');
INSERT INTO TEST_NULL VALUES (3,'Will','Denmark', 24,'Software Engineer');
INSERT INTO TEST_NULL VALUES (4,'Ben','Polland',NULL,'Actress');
INSERT INTO TEST_NULL VALUES (5,'Sian','FIA', 24,'Writer');
INSERT INTO TEST_NULL VALUES (6,'Rodger','Norway', 24,'Software Engineer');
INSERT INTO TEST_NULL VALUES (7,'Harry','USA',NULL,'Artist');
INSERT INTO TEST_NULL VALUES (8,'Kiyana','USA', 24,'Software Engineer');
INSERT INTO TEST_NULL VALUES (9,'Pradhush','USA', 24,'Writer');
INSERT INTO TEST_NULL VALUES (10,'Dawson','USA',NULL,'Painter');

Let us select the table and below output rows are display: –

select * from TEST_NULL;

isnull sql server output 3

Here in the above output, you could see that the age of the people is NULL for a few rows. Instead of entering the value of NULL, we can insert a default value as 99 if the age is not mentioned with the below statement.

SELECT *,ISNULL(AGE, 99)AS "FORMATTED_AGE" FROM TEST_NULL;

Output:

isnull sql server output 4

The value of NULL is replaced with the default value 99.

If you want to update the existing table with the same values uses the below statement: –

UPDATE TEST_NULL
SET AGE =ISNULL(AGE, 99);
SELECT*FROM TEST_NULL;

Output:

output 5

We can use the function in the insert statement as well as below: –

INSERT INTO TEST_NULL VALUES (11,'Sony','Korea',ISNULL(NULL, 99),'Painter');

Quickly let us select the mentioned row. 99 value will be saved instead of NULL.

SELECT * FROM TEST_NULL WHERE SERIAL_NO = 11;

The screenshot is for the same: –

output 6

Examples of ISNULL SQL Server

Below are the examples mentioned:

Example #1

Now let us see the usage of ISNULL () function in the SQL server.

Code:

select isnull('234567','replace value of the NULL')AS "IS NULL";

Output:

output 7

Example #2

Here in the above expression value is not NULL because of which the actual values is returned.

Code:

select isnull(NULL,'replace value of the NULL')AS "IS NULL";

Output:

output 8

Example #3

Here in the above expression value is NULL because of which the replacement values is returned.

Code:

select isnull('ROSE','Dawson')AS "IS NULL";

Output:

output 9

Example #4

Here in the above expression value is not NULL because of which the actual values is returned.

Code:

select isnull(NULL,'Rose')AS "IS NULL";

Output:

output 10

Here in the above expression value is NULL because of which the replacement values is returned.

Conclusion

ISNULL () function is used when you want a specific value that needs to be returned if the expression value is NULL. If the expression value is not null, then the expression value will be returned.

We get two arguments in the ISNULL () function. One is the expression and the other is value. Based on the expression it decides whether to return the expression value (if expression value is not null) or defined value (if expression value is null).

Recommended Articles

This is a guide to ISNULL SQL Server. Here we discuss how ISNULL in SQL Server works with respective examples and the expressions to understand in easy way. You may also look at the following articles to learn more –

  1. SQL IN Operator
  2. SQL INSTR()
  3. SQL Server Substring
  4. SQL Server Data Types

All in One Data Science Bundle (360+ Courses, 50+ projects)

360+ Online Courses

50+ projects

1500+ Hours

Verifiable Certificates

Lifetime Access

Learn More

0 Shares
Share
Tweet
Share
Primary Sidebar
SQL Tutorial
  • Advanced
    • SQL Formatter
    • SQL Injection Attack
    • Aggregate Functions in SQL
    • SQL REVOKE
    • SQL Select Distinct Count
    • IF ELSE Statement in SQL
    • SQL CASE Statement
    • SQL While Loop
    • SQL BIGINT
    • SQL Crosstab
    • SQL Wildcard Character
    • SQLAlchemy Filter
    • SQLAlchemy SQLite
    • SQLAlchemy DateTime
    • SQLAlchemy create_engine
    • SQL INSTR()
    • SQL now
    • SQL synonyms
    • SQLite?export to csv
    • What is Procedure in SQL
    • Stored Procedure in SQL?
    • SQL Server Constraints
    • SQL DELETE ROW
    • Column in SQL
    • Table in SQL
    • SQL Virtual Table
    • SQL Merge Two Tables
    • SQL Table Partitioning
    • SQL Temporary Table
    • SQL Clone Table
    • SQL Rename Table
    • SQL LOCK TABLE
    • SQL Clear Table
    • SQL DESCRIBE TABLE
    • SQL Mapping
    • Cursors in SQL
    • AND in SQL
    • Wildcard in SQL
    • SQL FETCH NEXT
    • SQL Views
    • SQL Delete View
    • Triggers in SQL
    • SQL UPDATE Trigger
    • SQL AFTER UPDATE Trigger
    • SQL Update Statement
    • SQL DROP TRIGGER
    • Types of SQL Views
    • SQL Port
    • SQL Clustered Index
    • SQL COMMIT
    • Distinct Keyword in SQL
    • PARTITION BY in SQL
    • SQL Set Operators
    • SQL UNION ALL
    • Metadata in SQL
    • SQL Bulk Insert
    • Array in SQL
    • SQL REGEXP
    • JSON in SQL
    • SQL For loop
    • EXPLAIN in SQL
    • ROLLUP in SQL
    • Escape Character SQL
    • SQL Cluster
    • SQL Backup
    • SQL Pattern Matching
    • SQL Users
    • ISNULL SQL Server
    • SQL pivot
    • SQL Import CSV
    • SQL if then else
    • SQL ignore-case
    • SQL Matches
    • SQL Search String
    • SQL Column Alias
    • SQL extensions
    • SQL Substring Function
    • Charindex SQL
  • Basic
    • What is SQL
    • Careers in SQL
    • Careers in SQL Server
    • IS SQL Microsoft?
    • SQL Management Tools
    • What is SQL Developer
    • Uses of SQL
    • How to Install SQL Server
    • What is SQL Server
    • SQL Server Versions
    • SQL Case Insensitive
    • SQL Expressions
    • Database in SQL
    • SQL Data Types
    • SQL Keywords
    • Composite Key in SQL
    • SQL WAITFOR
    • SQL Constraints
    • Transactions in SQL
    • First Normal Form
    • SQL Server Data Types
    • SQL Administration
    • SQL Variables
    • SQL Enum
    • SQL GROUP BY WHERE
    • SQL ROW
    • SQL EXECUTE
    • SQL EXCLUDE
    • SQL Performance Tuning
    • SQL UUID
    • Begin SQL
    • SQL Update Join
    • Cheat sheet SQL
  • Operators
    • SQL Operators
    • SQL Arithmetic Operators
    • SQL Logical Operators
    • SQL String Operators
    • Ternary Operator in SQL
  • Commands
    • SQL Commands
    • sqlplus set commands
    • SQL Alter Command
    • SQL Commands Update
    • SQL DML Commands
    • SQL DDL Commands
    • FETCH in SQL
  • Clause
    • SQL Clauses
    • SQL IN Operator
    • SQL LIKE Clause
    • SQL NOT Operator
    • SQL Minus
    • SQL WHERE Clause
    • SQL with Clause
    • SQL HAVING Clause
    • GROUP BY clause in SQL
    • SQL GROUP BY DAY
    • ORDER BY Clause in SQL
    • SQL ORDER BY CASE
    • SQL ORDER BY DESC
    • SQL ORDER BY DATE
    • SQL ORDER BY Alphabetical
    • SQL ORDER BY Ascending
    • SQL Order by Count
    • SQL GROUP BY Month
    • SQL GROUP BY Multiple Columns
    • SQL GROUPING SETS
  • Queries
    • SQL Insert Query
    • SQL SELECT Query
    • SQL SELECT RANDOM
    • SQL Except Select
    • SQL Subquery
    • SQL SELECT DISTINCT
    • SQL WITH AS Statement
  • Keys
    • SQL Keys
    • Primary Key in SQL
    • Foreign Key in SQL
    • Unique Key in SQL
    • Alternate Key in SQL
    • SQL Super Key
  • Functions
    • SQL Date Function
    • SQL String Functions
    • SQL Compare String
    • Timestamp to Date in SQL
    • SQL Window Functions
    • SQL CONCAT
    • SQL ALTER TABLE
    • SQL MOD()
    • SQL Timestamp
    • SQL TO_DATE()
    • SQL DATEADD()
    • SQL DATEDIFF()
    • SQL HOUR()
    • SQLite?functions
    • ANY in SQL
    • LIKE Query in SQL
    • SQL NOT NULL
    • SQL NOT IN
    • SQL MAX()
    • SQL MIN()
    • SQL SUM()
    • SQL COUNT
    • SQL identity
    • SQL DELETE Trigger
    • SQL Declare Variable
    • SQL Text Search
    • SQL COUNT DISTINCT
    • SQL TEXT
    • SQL Limit Order By
    • BETWEEN in SQL
    • LTRIM() in SQL
    • TOP in SQL
    • SQL Select Top
    • Merge SQL
    • SQL TRUNCATE()
    • SQL UNION
    • SQL ALL
    • SQL INTERSECT
    • SQL Alias
    • SQL Server Substring
    • CUBE in SQL
    • SQL RANK()
    • SQL MOD()
    • SQL CTE
    • SQL LAG()
    • SQL MID
    • SQL avg()
    • SQL WEEK
    • SQL DELETE
    • SQL DATEPART()
    • SQL DECODE()
    • SQL DENSE_RANK()
    • SQL NTILE()
    • SQL NULLIF()
    • SQL Stuff
    • SQL Ceiling
    • SQL EXISTS
    • SQL LEAD()
    • SQL COALESCE
    • SQL BLOB
    • SQL ROW_NUMBER
    • SQL Server Replace
    • SQL Server Permission
    • T-SQL INSERT
    • T-SQL Stuff
    • T-SQL ADD Column
    • SQL Ranking Function
  • Joins
    • Join Query in SQL
    • Types of Joins in SQL
    • Types of Joins in SQL Server
    • SQL Inner Join
    • SQL Join Two Tables
    • SQL Delete Join
    • SQL Left Join
    • LEFT OUTER JOIN in SQL
    • SQL Right Join
    • SQL Cross Join
    • SQL Outer Join
    • SQL Full Join
    • SQL Self Join
    • Natural Join SQL
    • SQL Multiple Join
  • NoSQ
    • NoSQL Databases List
    • NoSQL Injection
    • NoSQL vs SQL Databases
  • Interview Questions
    • SQL Interview Questions
    • Advance SQL Interview Questions
    • SQL Joins Interview Questions
    • SQL Server Interview Questions

Related Courses

JDBC Training Course

PHP course

Windows 10 Training

SQL Course Training

PL/SQL Certification Courses

Oracle Certification Courses

Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Database Management
  • Machine Learning
  • All Tutorials
Certification Courses
  • All Courses
  • Data Science Course - All in One Bundle
  • Machine Learning Course
  • Hadoop Certification Training
  • Cloud Computing Training Course
  • R Programming Course
  • AWS Training Course
  • SAS Training Course

© 2022 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA
Free Data Science Course

Hadoop, Data Science, Statistics & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA
Free Data Science Course

Hadoop, Data Science, Statistics & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more

EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Special Offer - JDBC Training Course Learn More