Data Analytics and Video Tutorials
Data is information an organization captures as part of its business that they store on databases. It is then used to serve their customers and help them make better decisions.
Normalization is a process of organizing data in a database to reduce data redundancy and ensure data integrity. There are several types of normalization, each with its own set of rules for eliminating data redundancy and improving data integrity. The most commonly used normalization levels are: There are also higher levels of normalization, such as…
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Denormalization is the process of adding redundant data to a database to improve query performance. It involves intentionally violating the normal forms of database design in order to simplify or speed up queries by reducing the number of joins or eliminating the need for certain indexes. The normal forms of database design are a set…
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In SQL, both CHAR and VARCHAR2 are character data types, but they have some differences in terms of their storage and usage. CHAR: VARCHAR2: Here’s an example to illustrate the difference: In the char_test table, the name and address columns are both defined as CHAR, with fixed lengths of 10 and 20 characters, respectively. If…
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SQL(Structured Query Language) and MySQL are related but distinct concepts. SQL is a programming language that is used to manage relational databases, while MySQL is a specific relational database management system (RDBMS) that uses SQL as its query language. Here are some key differences between SQL and MySQL: In summary, SQL is a language used…
CTE stands for Common Table Expression, and it is a temporary named result set that you can reference within a SQL statement. A CTE is defined within a query and is available only for the duration of that query. It allows you to create a named temporary table that you can reference multiple times within…
Lambda functions are anonymous functions that take any amount of arguments as their input, but can only have one expression. Let’s look at the function further Lambda functions are anonymous and are usually classified as user-defined functions but without a name. One thing that makes Lambda functions different from regular functions is that they do…
In our latest post, we are going to discuss formatting issues that you may come across. It relates to how you format the data when passing it from the input of a user. This scenario can happen as a result of user input, which then has some comparisons completed on it. How does the problem…
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Are you looking to learn python, and in the process coming across this error and trying to understand why it occurs? In essence, this usually occurs when you have more than one data frames and in the process of writing your program you are trying to use the data frames and their data, but there…
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So you are using Python and you have data stored in a data frame? You would like to present that on a webpage HTML table, but unsure how to achieve this. Well, read on to see two different methods that will help you. Pass the data to Javascript which then passes to the HTML the…
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In a recent post, we discussed arrays and what they mean, and how they differ from lists. When you have a list in an array, one of the things that you need to define is what data type it is. If you don’t then the array will throw the error that you are on this…
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