SQLite EXCEPT Operator Using ORDER By Clause

We are going to use order by clause with the except operator. ORDER By clause is used to arrange the result set in the certain order.

Syntax:

SELECT expression1, expression2, ... expression_n
FROM tables
[WHERE conditions]
EXCEPT
SELECT expression1, expression2, ... expression_n
FROM tables
[WHERE conditions]
order by;

Explanation od Syntax: In the query, our main focus to find and display a list of data (expressions) from specific tables. It removes any matching data from another selection based on defined conditions (WHERE clauses). Finally, it sorts the remaining results in a given order using ORDER BY clause.

Query:

Let’s retrieve a list of employee names as their first name and last name in descending order of last name, excluding those associated with certain departments.

SELECT last_name, first_name 
FROM employee
EXCEPT
SELECT dept_id,dept_name
FROM department
ORDER BY last_name desc;

Output:

Except using order by

Explanation: Here in the output you can see that last name and first name columns are retrieved in the descending order.

SQLite Except Operator

SQLite is a server-less database engine written in C programming language. It is developed by D. Richard Hipp in the year 2000. The main motive for developing SQLite is to escape from complex database engines like MySQL etc. It has become one of the most popular database engines as we use it in Television, Mobile Phones, Web browsers, and many more. It is written simply so that it can be embedded into other applications.

In this article, you will learn about the SQLite Except operator, its working, and its functionality by using some examples. We will perform various queries with the practical implementation for an in-depth understanding of the article.

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Conclusion

SQLite EXCEPT operator is used to retrieve only the first select statement data as the data of the second select statement is not fetched as we use the EXCEPT operator. Moreover the count of columns in both the select statements must be same and the data type too. It can be used only when you want to fetch the first select statement data. Witht the help of EXCEPT Operator, it returns only distinct rows, automatically removing any duplicates from the output. So EXCEPT Operator is maintain the performance optimization....