For an instructor lead, in-depth look at learning SQL click below.
SQL, or Structured Query Language, is a standardized programming language that’s used to manage and manipulate relational databases. Simply defined, SQL communicates with databases. Regardless of whether you’re a business analyst, data analyst, data engineer, or even a software developer, SQL is instrumental in handling, processing, and extracting meaningful insights from data. So, let’s simplify SQL!
What is SQL?
SQL is a language that allows you to communicate with databases by using queries. These queries can help you search, add, modify or delete data stored in a database. If working with data is part of your routine, SQL will be an indispensable tool.
Basics of SQL Queries
What makes SQL beginner-friendly is that its syntax closely resembles the English language. Let’s take a look at basic SQL operations using an example. Let’s say we have a database called ‘Students’.
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-- This is how you select data from a table SELECT * FROM Students; |
The above example selects all data from the ‘Students’ table within our database. Here, ‘*’ (asterisk) selects all columns.
Selecting specific data
You may not always want to select all data. Instead, you might want to focus on specific information like ‘First Name’ and ‘Last Name’ only. Here’s how you do it:
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-- Selecting specific data from a table SELECT FirstName, LastName FROM Students; |
The adjusted query will now only select ‘FirstName’ and ‘LastName’ from the ‘Students’ table.
Filtering data
Using the WHERE clause, you can filter the data you’re querying. Suppose you want to select only those students who are studying in Grade 10:
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-- Filtering data using WHERE clause SELECT * FROM Students WHERE Grade = 10; |
The above query filters out students who are only in ‘Grade 10’.
Why learn SQL?
SQL is one of the most sought-after skills in the IT field. It’s a standard language for dealing with data. From startups to MNCs, organizations across scales are looking for professionals skilled in SQL. Moreover, mastering SQL can offer fantastic career opportunities and impressive job prospects.
I hope this overview simplifies SQL for you. Remember, practice is key when mastering a new language, including SQL. Happy querying!