Sql Set Operators

Nicole Darnley

UNION and UNION ALL in SQL Explained

In this article, we’ll explore the SQL clauses UNION and UNION ALL. Learn what they do and when to use each one. I had been an analyst for probably four years before I knew about the SQL clause UNION ALL. I used UNION on a regular basis, but had never heard of its counterpart. Then one day when I heard a coworker talking about it. I thought to myself, “What is he talking about?

Andrew Bone

UNION vs. UNION ALL in SQL: What’s the Difference?

UNION and UNION ALL are both used to retrieve records from multiple tables. This article will detail the differences between the two, allowing you to make the best choice for each unique scenario. You can use SQL’s UNION and UNION ALL commands to get data from multiple tables in your database. It’s a common use case, considering that most databases have many tables. Both UNION and UNION ALL are known as set operators.

Andrew Bone

What Do the SQL INTERSECT and MINUS Clauses Do?

Do you know the difference between SQL’s INTERSECT and MINUS clauses and how to use them? You will find examples and explanations in this article. SQL INTERSECT and MINUS are useful clauses for quickly finding the difference between two tables and finding the rows they share. INTERSECT compares the data between tables and returns only the rows of data that exist in both tables. MINUS compares the data between tables and returns the rows of data that exist only in the first table you specify.

How to Combine the Results of Two Queries in SQL

Problem You’d like to display data from given columns (of a similar data type) from two tables in SQL. Example There are two tables in our database: employee and customer. The employee table contains data in the following columns: id, first_name, last_name, and age. idfirst_namelast_nameage 1TomMiller22 2JohnSmith26 3LisaWilliams30 4CharlesDavis21 5JamesMoore22 The customer table contains data in the following columns: id, first_name, last_name, and age.

Marek Pankowski

SQL Set Operators: Union, Union All, Minus, Intersect

Ever heard terms such as union and intersection in SQL? They're examples of set operators, and they come in handy when you need to combine information from multiple tables or queries. In this article, we'll take a closer look at them. SQL queries let us choose the most important bits from large amounts of information. Of course, we can't expect that all necessary data will be stored in one table.

Aldo Zelen

Refine Results with SQL Set Operators

Using UNION, UNION ALL, EXCEPT, and INTERSECT to manage SQL query results. The function of SQL set operators is pretty simple; they allow us to combine results from different SQL queries into one result set. The best way to understand how set operators work is to use visual methods like the Venn diagram. For those of you not familiar with Venn diagrams, they are two circles that represent items or collections of items.