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Visual Representation of UNION Operator

Union Operator Structure

Here In the image we can clearly saw that we have two columns and they are named as SELECT A, SELECT B and they are having the same data type combined together with the UNION operator to form the single column. In the UNION Column their is no duplicate value present which signifies that UNION Operator remove the duplicates values. This is how the UNION operator works.

SQLite Union Operator

SQLite is a server-less database engine and it is written in c programming language. It is developed by D. Richard Hipp in the year 2000. The main moto for developing SQLite is to escape from using 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, we will learn about the UNION Operator in SQLite also their examples, and so on. After reading this you will have decent knowledge about the UNION Operator and you can easily perform queries.

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SQLite UNION Operator

SQLite UNION operator is used to combine the result set of different SELECT statements and to fetch the output as a single result set. It is used to remove the duplicate rows that are fetched. However, there needs to be a similar number of columns or expressions that need to be specified in each SELECT statement and even the columns must be of the same data type too....

Visual Representation of UNION Operator

Union Operator Structure...

Example of SQLite UNION Operator

To understand the UNION Operator we need a two table on which we will perform some operations and queries. Here we have created to table called department and employee. The department table consist of dept_id, dept_name. The employee table consist of dept_id, emp_id, first_name, and last_name as Columns. iF you don’t know How to Create Tables in SQLite then refer this....

Conclusion

In this article we have learnt about the SQLite UNION, UNION WITH ORDER BY with examples. UNION are used to combine the result set of multiple select statement and where as UNION operator does not allow duplicate rows. ORDER BY is used to arrange the rows in the specified order. By the end of the article you will get a knowledge on the UNION operator that is the functionality, when to use and where to use....

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