Modified on
23 Feb 2022 07:39 pm
Skill-Lync
SQL skills are extremely valuable in this increasingly digitised economy,with demand for SQL developers also on a continuous rise. However, just knowing the basics of SQL will not help you secure top industry jobs. In order to excel in the field, you need to diversify your skillset and master certain intermediate concepts. Once you have learnt about SQL dialects, importing SQL data, and writing basic SQL queries, upgrade your skillset to more advanced concepts. And if you want a guide on where to start, read ahead for a list of intermediate SQL concepts that you must master in order to become an SQL specialist.
SQL contains five main sublanguages which refer to different tasks. These are listed below. In order to master SQL, you need to learn all these languages.
Another concept that you must master in order to become an SQL specialist is Unions and Joins. The data used by SQL developers are spread across multiple tables, and SQL can be used to merge these tables and combine all the data in one place. UNION and JOIN deal with tables. A UNION can stack two tables with identical columns on top of each other. And different Joins will help return combinations of rows from the tables being joined together.
Once you have learnt the basics of SQL syntax such as the functions SELECT, FROM, WHERE, GROUP BY and become proficient in database design, you are well on your way to learning advanced SQL syntax. What does that entail, you ask? Read on for a list of advanced SQL syntax you need to master in order to become an SQL specialist.
When you want to become an SQL specialist, you need to think of business questions more critically. The theory is all well and good, but it is hard to translate questions into SQL queries in practice.
First things first, before beginning to type, create an outline or overview of the different pieces you need for your query. For instance, do you need to filter data using a where statement? Do you need to use aggregate functions?
It is always important at an advanced stage of SQL for a specialist to develop multiple ways of doing the same thing. This will help will quality checks and validation of results.
Use code commenting on writing your business question. This will help guide your SQL query.
An SQL specialist must know how to compile a central depository for data elements they are using. This data dictionary must contain descriptions of different tables and fields used and include different data types in each column (character, integer, money, date, etc.) and a brief column description.
Testing your query is extremely important. Build your query at a time and run it frequently to ensure it works properly. By adding pieces one at a time, you avoid going through the code line by line and save time.
Before performing queries, you need to first understand the data elements. Begin with viewing the entire database, then narrowing down to a few columns and then analysing values - both categorical and quantitative - all to have an overview of the information contained in the table.
Keep a list of assumptions at hand when writing data code so that you can track your limitations and dependencies.
Once you have finished writing your query, you still need to understand the results. Subsequently, you must perform quality checks to confirm analysis understand your results and perform quality checks to make sure your analysis is correct.
Last but not least, in order to become a pro at SQL coding, it is important to practice any chance you get. Test code, check if it works, modify, run again, and so on till you become proficient in coding principles and syntax.
In this article, we discussed the advanced SQL skills and concepts you need to master to become an SQL specialist. However, it is impossible to acquire all these skills sitting right at home. Help boost your CV and also receive guided assistance by the option for professional SQL certifications.
A database developer is in high demand and can be employed in various roles and working on different responsibilities such as data analysis, web analysis, business intelligence, data modeling, database administration, and database design. But such jobs require experts with high-level skills or experience.
What is the solution? An SQL course. SQL Course Fees in India depend on the particular course and range from INR 6,000 - INR 20,000. And are a small cost for the long-term investment and high-paying jobs you stand to gain after completing the course. An SQL course is the perfect bridge between basic knowledge and advanced skills and is bound to get you the job of your dreams.
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Anup KumarH S
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