Simple-to-understand SQL

In the age when Data is a treasure trove, whether you are a Digital Marketer, Data Analyst or a Developer, SQL skills are a key guide to help you get your data used professionally. Today we will get to know SQL with techniques that help you get started right away!

What is ❓ SQL? (Structured Query Language)

SQL (S-Q-L) is the standard language used to talk to databases. It's like an "interpreter" that allows us to command computers to find, edit, or organize the huge amount of data stored in tables.

Imagine following:

If the database is a giant account book, SQL is the command we use to tell the librarian: "Please pick up the list of customers who bought more than 1,000 baht in January"!

🛠️ 4 most commonly used basic commands (CRUD Operations)

If you remember these 4 commands, you can start using SQL!

SELECT (Retrieve): Used to browse the required data.

Example: SELECT name FROM customers; (pull out a full list of customers)

INSERT (ADD DATA): Used to put new data into the table.

Example: Add a new customer name to the system.

UPDATE (Data Edit): Used to turn already existing data into current.

Example: Change the customer's delivery address.

DELETE (Delete Data): Used to remove unwanted data.

Example: Remove the list of discontinued goods.

✨ Why is SQL a "Must-have" skill?

Manage huge data quickly: Excel may freeze when it comes to a million rows of primary data, but SQL manages it in a fraction of a second!

Job market demand: Virtually all companies use databases (MySQL, PostgreSQL, SQL Server). People who write SQL are therefore likely to get high jobs and good salaries.

Easy to build on the Data Line: It's a key basis for people who want to be Data Scientist or Business Intelligence (BI).

🚀 How to start learning SQL for newbies

Understand table structure: Understand row (Row) and column (Columbia) matters

Try the free tool: practice writing through websites like W3Schools or SQLZoo.

Practice with real problems: Let's question the data and write a command to find the answer.

💡 Conclusion: SQL is not as difficult as it seems! If you understand the "command table" principle, you will be able to turn raw data into "value data" immediately.

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