Since the purpose of writing SQL is to retrieve data, cyprus phone number library no matter how the SQL is written, a table containing multiple columns will be retrieved in the end, which may look like this:
Imagine the table fields you will eventually retrieve
| id | date | channel | device |
| 001 | 2023-01-01 | iPhone | |
| 002 | 2023-01-01 | FB | Google Pixel |
| 003 | 2023-01-02 | FB | iPhone |
Regardless of whether the data is cleaned or organized, there will be fields in the end. When we write SQL, we must make sure we know what the data we retrieve will look like in the end, including: 3 ways how to learn how many fields there are. What the values in the fields should be reasonable, and the estimated number of data rows.
There are many benefits to thinking this special features & convenience through. The first is that you can discover errors immediately. When the data comes out different from what you expected, you will of course further check whether there is any mistake, instead of foolishly using it directly, causing subsequent analysis and conclusions to be wrong.
The second benefit is that it can help you think clearly about what you want to do with this information. From an analytical perspective, this is a very important step. Usually, exploratory analysis is acceptable to just take a look at the data first , but when you really start analyzing the project, you should avoid looking around and be clear about what you are looking at. This not only allows the SQL syntax to be more concise, but also helps you clarify your entire thinking before analysis.
Conclusion
In fact, I strongly recommend that people of all a toll-free number for a seamless experience functional roles learn the SQL language. First, it is not difficult. Second, it is a plus in the workplace. Imagine that after learning SQL, you can even get the data for performance reports by yourself without having to wait for analysts to help you. Isn’t this a great thing? The last reason for the recommendation is that I found that many companies are promoting the use of SQL among their employees. So in order not to lose at the starting point of job hunting, it is necessary to learn SQL!
However, there are not many people sharing SQL related switzerland leads content now, so I will start to update 30 days of SQL teaching content on my IG every day . Each teaching will be accompanied by practice questions of actual problems encountered in work scenarios . I invite you to follow my IG. It only takes 5 minutes a day, and let’s learn SQL together in 30 days!
