NOT EQUAL Operator Examples
Let’s look at some examples of the NOT EQUAL Operator in SQL, and understand its working.
First, we will create a demo SQL database and table on which we will use the NOT EQUAL operator.
Demo SQL Database
In this tutorial on the NOT EQUAL operator, we will use the below table for examples and see the NOT EQUAL operator in SQL query.
| user_id | name | contest_score | rank | coding_streak |
|---|---|---|---|---|
| vish3001 | Vishu | 100 | 1 | 150 |
| neeraj119 | Neeraj | 99 | 2 | 125 |
| ayush105 | Aayush | 98 | 3 | 110 |
| sumit85 | Sumit | 99 | 2 | 100 |
| harsh05 | Harsh | 98 | 3 | 95 |
To create this table in your system, write the following SQL queries in your DBMS;
CREATE TABLE w3wiki(
user_id varchar(100) PRIMARY KEY,
name varchar(100),
contest_score int,
rank int,
coding_streak int
);
INSERT INTO w3wiki(user_id,name,contest_score,rank,coding_streak)
VALUES('vish3001','Vishu',100,01,150);
INSERT INTO w3wiki(user_id,name,contest_score,rank,coding_streak)
VALUES('neeraj119','Neeraj',99,02,125);
INSERT INTO w3wiki(user_id,name,contest_score,rank,coding_streak)
VALUES('ayush105','Aayush',98,03,110);
INSERT INTO w3wiki(user_id,name,contest_score,rank,coding_streak)
VALUES('sumit85','Sumit',99,02,100);
INSERT INTO w3wiki(user_id,name,contest_score,rank,coding_streak)
VALUES('harsh05','Harsh',98,03,95);
SQL NOT EQUAL operator For String Example
In this example, we will display all those rows which do not have a name equal to ‘Harsh’. We will use NOT EQUAL with WHERE clause in this case.
Query:
SELECT * FROM w3wiki WHERE name!='Harsh';
Output:
SQL NOT operator For String
In the above image, we can see we have all those rows displayed which do not have their name equal to ‘Harsh’.
Note: The NOT EQUAL comparison is case-sensitive for strings. Meaning “geeks” and “GEEKS” are two different strings for NOT EQUAL operator.
SQL NOT EQUAL Operator with Multiple Condition Example
In this example, we will display all those rows which do not have their contest score as 98 and rank as 3 and the coding streak should be greater than or equal to 100. Using AND or OR operator you can use the SQL NOT operator for multiple values.
Query:
SELECT * FROM w3wiki
WHERE contest_score != 98 AND rank != 3
AND coding_streak >= 100;
Output:
SQL NOT EQUAL Operator with Multiple Condition
In the above image, we can observe that all those rows are displayed which have followed all three conditions.
SQL NOT EQUAL Operator with GROUP BY Clause Example
In this example, we will display all those ranks with their count that do not have their contest score as 100 using GROUP BY clause.
Query:
SELECT rank, COUNT(*) as count_score
FROM w3wiki
WHERE contest_score <> 100
GROUP BY rank;
Output:
SQL NOT EQUAL Operator with GROUP BY Clause
In the above image, we can see ranks 2, and 3 have a count of 2 and, 2 respectively.
Also Read: EQUAL Operators in SQL
SQL NOT EQUAL Operator
SQL NOT EQUAL Operator is a comparison operator used to check whether two expressions are equal. This operator is represented by ” != ” or “<>“.
Contact Us