What is data processing?
Tableau:
Tableau is a fast-growing visualization application that may be utilized in a range of business situations. It is a popular piece of software because of its ease of use. It is often employed in BI (Business Intelligence).
Tableau’s layout makes it possible to view a large variety of charts, plots, and graphs at once.
What is data and what are its types?
● Data as a general concept refers to the fact that some existing information or knowledge is represented or coded in some form suitable for better usage or processing.
● An example of data is information collected for a research paper. An example of data is an email.
● Data types are divided into two groups: Primitive data types — includes byte, int, long, float, boolean and char. Non-primitive data types — such as String.
What is Data Processing ?
Data processing is the process of transforming raw data into useful information. In order to solve a problem or improve an existing condition, data is altered in a scientific manner. Inputs (raw data) are fed into a process (computer systems, software, etc.) in a similar fashion as a production process (information and insights).
Organizations typically use computers to perform a sequence of operations on data to show, interpret, or gather information. Data entry, summarization, calculation, and storage are all part of the process. Diagrams, reports, graphics, document viewers, and other relevant output formats are used to provide useful and instructive results.
What are the Stages of Data Processing?
● This is the most important step in the process because the quality of the data obtained will have a significant impact on the final product. It is imperative that the data acquired be precise and well-defined during the collection procedure.
● It is necessary to manipulate data so that it may be used for further investigation and processing. A data set for further investigation and processing is created through the process of preparation by combining data from several sources.
● Input is the process of converting validated data into a form that can be handled by an application.
● Machine Learning and Artificial Intelligence algorithms can be used to perform a variety of complex technical changes on data in order to obtain an output or interpretation about the data.
● User-friendly output and interpretation is what happens at this point in processing.
● Data and metadata (information about data) are stored for future use at the end of the data processing cycle. The cycle’s significance is that it facilitates rapid access and retrieval of the information processed.
What is a database and a relational database management system?
● A database is an organized form of model that has rows and columns.
● There are n number of rows and a specific number of columns
● A relational database management system (RDBMS) is a common type of database where the data is stored in structural format i.e in a tabular format by using rows and columns.
What are types of Tableau Products?
The types of Tableau Products are:
● Tableau Desktop
● Tableau Server
● Tableau Public
● Tableau Reader
● Tableau Online
What is Tableau Desktop?
● Tableau Desktop is a business intelligence & data visualization software tool that can be used by anyone.
● Tableau Desktop converts boring tabulated data into eye-candy graphs and representations.
● There are 2 types of Tableau Desktop.
○ Tableau Personal:- It has limited access to the amount of data sources that you can connect to, and has development capabilities.
○ Tableau Professional :- It has access to a wide range of data sources that you can connect to every type of data and channel distribution, and has the same development capabilities as that of Tableau Personal.
What is Tableau Server, Tableau Public, Tableau Reader & Tableau Online?
● Tableau Server :- It is essentially an online hosting platform to hold all your Tableau workbooks, data sources and allows the users to publish, share and administrate the interactive charts, workbooks and dashboards.
● Tableau Public:- It’s a free service that lets anyone publish interactive data to the web, including a free desktop product which can be downloaded and publish interactive data visualization to the web.
● Tableau Reader:- It is a free-to-download tool that allows you to view packaged workbooks with full interactivity. It is used to filter and view data.
● Tableau Online:- It is an analytics platform fully hosted in the cloud premises. It requires a license for each and every individual user.
What is Tableau Architecture?
Tableau Server is designed in a way to connect many data tiers. It can connect clients from desktop, mobile, and web. Tableau Desktop is a robust data visualization tool.
The components of Tableau Architecture are:
● Data Server
● Data Connectors
● Components of Tableau Server
● Gateway
● Clients
How does Tableau Architecture Work?
● Data Server
○ Tableau can connect to multiple data sources. These data sources can be on-premise or remotely located. It can connect to a database, excel file, and a web application all at the same time.
● Data Connectors
○ The Data Connectors provide an interface to connect external data sources to Tableau Data Server.
○ Tableau has an in-built ODBC/SQL connector. This ODBC Connector can connect to any database without using their native connector. Tableau has an option to select both live and extract data.
○ Live Connection or Real time data: Tableau can connect to real time data by linking to the external database directly. This feature can link to the live data with Tableau rather than importing the data.
○ Extracted or In-memory data: Tableau has an option to extract the data . from external data sources. We can make a local copy in the form of a tableau extract file. It can extract millions of records in the Tableau data engine with a single click.
● Components of Tableau Server
○ Application Server
■ The application server is used to provide the authentications and authorizations. It handles the administration and permission for web and mobile interfaces.
○ VizQL Server
■ VizQL server is used to convert the queries from the data source into visualizations. Once the client request is forwarded to the VIEL process, it sends the query directly to the data source and retrieves information in the form of images.
○ Data Server
■ Data server is used to manage and store the data from external data sources. It is a central data management system. It provides metadata management, data security, data storage, data connection and driver requirements.
● Gateway
○ The gateway channelizes the requests from users to Tableau components. The gateway works as a distributor of processes to various components
● Clients
○ The dashboards and visualizations in Tableau server can be viewed and edited using different clients. The Clients are Tableau Desktop, web browser and mobile applications.
What are the advantages of using Tableau?
There are 4 benefits of using Tableau, They are:
● Tableau clearly and beautifully visualizes the data, at its core since Tableau is a data visualization tool.
● Tableau is easy to use.
● Tableau has an excellent user experience.
● Tableau can handle large amounts of data.
What is DAX and where will you find DAX in Tableau?
● DAX is (Data Analysis Expression), which involves a lot of calculations in any of the data analysis functions.
● Tableau has a lot of inbuilt functions which help in creating expressions for complex calculations.
● You can find DAX functions of Tableau In Calculated Field Area.
What are the KEYS through which the Joins can be made in Tableau?
There are 4 types of KEYS in Tableau through which the Joins can be made:
● Primary key.- A primary key is a combination of fields which uniquely specify a row. This is a special kind of unique key, and it has an implicit NOT NULL Constraint.
● Foreign key:- A foreign key is one table which can be related to the primary key of another table.
● Composite Key:- A primary key having two or more attributes is called a Composite key. It is a combination of two or more columns.
● Surrogate Key- A Surrogate key is a natural key which uniquely Identifies single record in a table.
