How to use NOT IN Clause In SQL
A subquery is a query that uses the result of another query to get the final result. There are multiple ways through which we can use subquery to get the our output. In the below query, we first select the name of professors that are present in the hod table and then use NOT IN clause to exclude them in the outer query.
SELECT * FROM professor
WHERE name NOT IN
(
SELECT name FROM hod
);
Output:
Output
Explanation: This above query selects all records from the “professor” table where the name does not exist in the “hod” table.
How to Select Rows that Don’t Exist in Other Table in PostgreSQL?
In PostgreSQL, there are times when we need to find records in one table that do not exist in another table. This can be useful for various data manipulation tasks and ensuring data integrity.
In this article, we will explore different approaches along with examples to achieve this using PostgreSQL. By the end, you will have a clear understanding of how to efficiently select rows that don’t exist in another table which help to improve your data management skills in PostgreSQL.