Learn applied sql program | Online Certification Course
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Learn SQL - basic terms Vol II
Next things are JOINs, that allow you to combine tables - to understand how basic JOINs work, imagine two intersecting sets, and all the possibilities of selection of the areas covered by the sets.
JOINs and an example
In your SQL learning process, JOINs will be of utmost importance. So, let’s go through them with an example.
And to understand the work that they do easily, let’s start with the INNER JOIN, which operates on two arguments, these are tables in this example, takes them and returns only the records that match a specified beforehand condition in both tables, for instance, there are two tables of children males born in 2000 and second table, of females that were born then, And should you wish to see only the people, regrdless of their sex, who were born in November, that’s the job you want the JOINs to give.
So there, a full JOIN, where all the area is selected, left JOIN, where the left set and the common groung, right JOIN, inversely, and inner JOIN that selects only the common ground, where the sets intersect. JOINs if used corerctly ,will get you the results from the tables you need, and the data organization and filtration, also sometmes called in a specific context, normalization, is you can say, the essence of what the data scientists do on their jobs, but in this case, in a nutshell.
That’s it, folks, see you in next episode!
More here: https://academy.vertabelo.com/blog/learning-think-sql/
Learn SQL - basic terms Vol I. - an intro
Learning SQL takes learning to think in SQL - what are the essentials of SQL programming? Well, if you wanna know, keep reading, shortly you will know!
First of all, SQL stands for Structured Query Language. First of all, what you will see, are tables, where rows are called records, and the columns are called attributes - unlike in the Excel spreadsheets, usually. Thus, here are your the most basic concepts, and there will be more of them upcoming, that will effectively introduce you to the world of SQL queries, and the data science that is built on them. So, what’s next, then?
We’re absolute beginners
Clauses - these are the important expressions in the SQL programming language, with them you will be able to build a data set you will need to start work on. To name some examples of the most basic clauses, essential for building your first data sets, these could be WHERE, that when usd with specific logical operators, with which you have dealt with if you encoutered any Boolean operators in a programming langauge, for instance in Java.
That’s it for now, see you in the next episode!
See more here: https://academy.vertabelo.com/blog/learning-think-sql/
