When it comes to changing careers to become a data analyst, about 90% of people will recommend that you learn SQL. The reason is that before doing any analysis, you must retrieve the data from the database, and SQL is the language you use to communicate with the database about what data you want to retrieve.
SQL is a very easy language and is not even considered a croatia phone number library programming language, but it is somewhat similar in terms of operating logic. But even with such an easy language, I still encountered many setbacks when I was self-studying. I had to think for a long time about simple questions. Later, I looked back and realized that there are actually some ways that can help beginners speed up the learning process a little.
Here are three ways to help you learn SQL faster.
How to learn Understand the concept of data types
In programming languages, data has different types, and data in a database is no exception. The most commonly used types are str (string), int (integer), date, and timestamp. But what does this have to do with our use of SQL?
Suppose we store a value called Google in a the best advertising is an easy-to-remember number column called channel. When you want to retrieve the data, you must use the following condition channel = ‘Google’ so that the computer will understand that this is a str value.
When you first start learning SQL, there is a high chance that you will run into a wall on such small details. It is recommended that you first understand the data type, which will reduce the chance of making such mistakes!
Make good use of visual learning to improve logical thinking ability
As a beginner, the problem I often encounter is that I lack imagination about the execution process of the grammar, and I don’t have a good grasp of the logic of writing SQL.
At this time, making good use of visual learning and visualizing the SQL execution process can help you understand the operating logic of SQL (not only when learning SQL, I think this method also benefited me a lot when learning Python).
I recommend the website SQLflow . You can paste switzerland leads your own SQL into it to see how it works. Or if you see a long SQL written by someone else but don’t quite understand it, you can also post it in. It can help you understand the logic of the entire SQL, such as what the main table is, the connection conditions, what field data each table provides, how to obtain it, etc.
