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SQL Fiddle: The Best Resource to Practice SQL online

Learning how to write effective SQL queries is tough especially if you have a tight budget and finding decent resources to help you in practicing SQL online that can cover a wide range of topics is even more difficult.

SQL is an easy programming language that can be learned in a few hours but you should have the right resources to master the concepts. Although it is easy getting familiar with basic SQL concepts, it can be harder getting the real-world experience.

When you are trying to learn SQL queries but having a little difficulty in retaining database concepts then SQL Fiddle can be the wonderful choice to go. Moving ahead, let us discuss the SQL Fiddle database testing tool in detail and how it works for you to make the database development task easier.

About SQL Fiddle

SQL fiddle tool is highly useful for beginners to advanced SQL programmers. Here are the few reasons why should you use it:

  • It allows you to practice SQL code online for a wider range of databases.
  • It helps you to get familiar with different databases before you enter the real programming world of SQL.
  • It allows you to share code and get help when needed. You can use SQL Fiddle for database generation, write queries, and send the unique URL to anyone you want to share the code.
  • It helps you to get help with queries you find difficult and increases your practical knowledge of SQL concepts.

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Read: Difference Between Stored Procedure and Function in SQL Server

Why SQL Fiddle database testing tool is useful?

If you are not sure of basic database concepts then SQL Fiddle online website is quite useful to you. If you are a database developer then here are a few use-cases intended for you.

  1. When you want help with a tricky query and you would like to post a question to the Q/A site like Stack Overflow, SQL Fiddle can be useful. First of all, build a database schema and post the link to your question. As you use the site, unique URL will be created for each database and you just have to copy and paste the URL that you want to share. This link is available for everyone who wants to explore it. Now, users will be able to answer your query and they can send a backlink to your query.
  2. When you want to contrast or compare SQL statements for different database backends, SQL Fiddle can be useful. It lets you switch between different databases and quickly evaluate the query porting efforts or language options available for each environment.
  3. When a database platform is not available quickly but you want to check how a particular will look in that environment, SQL Fiddle can be useful for this purpose. With SQL Fiddle, you don’t have to spin up a whole installation for your evaluation. You just create the database and queries directly into SQL Fiddle.

How SQL Fiddle Works?

The DDL schema can be used to generate the private database on the fly. If anything changed in the DDL (even a single comma) then it is promoted to generate a new schema and you will be operating in a new database. How SQL Fiddle Works? All SQL queries run within a single transaction and get immediately rolled-back once SQL executes. It is because the underlying database structure is the same for all queries that allow it to share the code online anonymously with unlimited users. SQL Server quiz Once you create the database schema, write queries, unique URLs refer to that particular schema and it is clearly visible in the address bar. This URL can be shared with anyone and they would be able to see what has been completed so far. Also, you can use your normal browser functions like back, forward or reload and observe the different stages of the work as you would expect.

How multiple database options are different in SQL Fiddle?

Here are a few things worth pointing about the implementation of different databases on SQL Fiddle.

MySQL supports queries that read data from the schema like SELECT query. This database ensures a consistent schema when different users are fiddling with it. The other database options allow a wide range of queries supported in the backend. SQL Lite runs in the browser and allows to navigate through different browser options.

Next, semicolon [;] button is added under each panel that determines how queries can be broken down for each panel before they are sent off to the database. This button pops down the list of different query terminators that are used as a flag to indicate query has been ended.

Read: SSIS Interview Questions & Answers for Fresher, Experienced

This terminator indicates how to parse the text before any query is executed. Most of the times, you don’t have to touch this button because its value is generally defined using stored procedures. Be careful while dividing the query into parts as it should be logical otherwise errors are certain if the procedure gets divided into incorrect parts.

SQL Lite Storage options at SQL Fiddle

SQL lite is a special case amongst different databases but it implemented the same way as other with a backend host responsible for the query execution. SQL Lite allowed for some interesting alternatives that we will discuss below.

  1. The first option is SQL.js, the implementation of engine translated into JavaScript. It signifies that instead of using my servers and limited memory, you could offload the work on to your browser. It is a great achievement but SQL.js has few drawbacks too. First is that it taxes the browser a bit when loaded to the memory first. The other is that it supports limited browsers only not all.
  2. The other alternative is WebSQL that makes use of SQL Lite implementation and it comes built-in with some browsers like Chrome, Safari or more. The advantage of using WebSQL over SQL.js is that it loads the schema a bit faster and run the queries. The disadvantage is that it is not supported widely.

Together, these two storage options allow SQL Lite to run within any browser. If one option does not support any particular browser then switch to another option. You may either get a better browser.

Who built SQL Fiddle and why?

A web developer, Jake Feasel from Anchorage, Alaska built SQL Fiddle website in January 2012. He had been answering questions on Stack overflow Q/A site since a long time related to main categories like SQL, jQuery, and Cold Fusion etc. free SQL Server demo He found JS Fiddle as a wonderful tool to answer JavaScript queries but nothing was available to help SQL developers till the time. So, Jake Feasel was inspired to build something that can help developers for SQL question. This was the reason how SQL Fiddle was originated and considered as a wonderful tool today to assist SQL developers effectively.

Conclusion

Read: What is a CASE Statement in the SQL?

Before you appear for an interview, get familiar with SQL basics and practice SQL problems continuously. When you are sure that you have a decent knowledge of SQL concepts, you may appear for interviews. SQL Fiddle can work as a wonderful asset here for writing queries and practice SQL online.

Make sure that you are using the best coding practices while coding as bad coding habits may impact your programming career in the future. Above all, have fun, enjoy learning, and follow all the best practices as much as possible.


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