What Is Vertabelo’s SQL Cheat Sheet?

SQL fundamentals, extras, tips

Everyone, from rookie programmers to SQL ninjas, needs a bit of help now and again. Enter Vertabelo’s SQL Cheat Sheet!

Working with databases is hard. There’s a lot of data to manage, which can be daunting. But the main challenge many database users face is the SQL commands themselves. It’s all right when you’re using the same familiar ones day after day, but what about the commands you dust off once or twice a year? Or what if you’re just getting started with SQL? That’s a lot to remember!

At Vertabelo Academy, we believe the best way of learning is by doing. But we’re also realists, and we know that sometimes everyone need a little help. That’s why we created the SQL Cheat Sheet: to help you find quick answers for the most common SQL questions.

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What’s Inside?

SQL Queries Cheat Sheet is like the learning process on steroids. It covers basic SQL concepts, including how to:

  • Retrieve data
  • Work with single and multiple tables
  • Group data
  • Aggregate data

We also include more advanced operations, like:

  • Using subqueries
  • Performing set operations on data

The Cheat Sheet comes packed with examples queries, illustrations, and explained sample result tables that let you understand why this command does what it does.

SQL Beginner? We’ve Got The Basics.

If you’re just beginner with SQL, you need to know how to build a query. Starting with the SELECT statement, the Cheat Sheet shows you how to get syntax right the first time. We also show you how to list one or several columns in your SELECT statement.

The next step towards SQL mastery is to learning the WHERE clause and its various comparison operators ( IN, LIKE, IS NOT NULL, and BETWEEN AND). These operators let you choose the data you need, and they can be combined logical operators and multiple conditions. Sounds complicated, doesn’t it? Don’t worry; the Cheat Sheet will walk you through it.

Maybe you can write SELECTs and WHEREs like a pro, but you’re having trouble working with multiple tables. The Cheat Sheet will explain how and when to use INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN methods. You’ll find examples of how to use each one in your queries.

Advanced Users? Check Out Our Pro Tips.

If you are more advanced SQL user, you may occasionally need help with some of SQL’s powerful features like aggregation functions, subqueries or set operations. It’s not just you – aggregation and grouping commands can be really frustrating, especially when you only use them occasionally! Our Cheat Sheet will give you step-by-step examples of the COUNT function, including the use of asterisks and column names as parameters.

There’s nothing worse than having a mess in your data. Knowing how to return data that’s been grouped or filtered based on aggregate functions can really help you clean things up. To this end, we show you how to work with ORDER BY, GROUP BY and HAVING in these circumstances. We’ll explain how to retrieve result rows using distinct values as a parameter in an aggregate function, which will really amp up your queries.

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SQL Cheat Sheet also demystifies SQL subqueries, so no worries if you can’t remember the syntax. We cover the lot: single-value, multiple-value, and correlated subqueries. You’ll also find out:

  • How to use equality or IN operators with subqueries returning single or multiple values
  • When to use the EXISTS operator
  • What inequality operators are and how to use them
  • The proper SQL syntax of the set operations like UNION, UNION ALL, INTERSECT, EXCEPT, and MINUS.

Stop querying in the dark. Download the free Vertabelo SQL Cheat Sheet right now!


 

Data Science Writer @ Vertabelo

  • Ron Santos

    Good 2-Page Aid (with 1 Minor Error)

    This two-page cheat sheet is useful and helpful. I did notice one small error on page two in the lower left at the bottom of the section named “Subqueries” that contains the following query:

    SELECT name FROM city WHERE country_id IN (SELECT country_id FROM country WHERE population > 20000000);

    However, based on info and testing in Vertabelo’s “SQL Basics” course, I believe the correct query is as follows:

    SELECT name FROM city WHERE country_id IN (SELECT country.id FROM country WHERE population > 20000000);

    The difference is that the second instance of country_id in the first query should be country.id. I wanted to let others know about this since originally it confused me and it might confuse others too. (I also sent email to Vertabelo on this correction but have not heard back on it.)

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