It can be performed interactively with the help of data wrangling tools, or as batch processing through scripting.Īnswer: The data profiling is nothing but a process of validating or examining the data that is already available in an existing data source, so the data source can be an existing database or it can be a file.
#Basic data analytics interview questions software#
There are different ways of performing data cleansing in different software and data storage architectures. The purpose of all these activities is to make sure that the database contains only good quality data, which can be easily worked upon. What do you understand by data cleansing?Īnswer: Data Cleansing, also referred to as data scrubbing, is the process of modifying or removing data from a database that is incomplete, inconsistent, incorrect, improperly formatted, or redundant. Today, data analysts can be found in a wide array of industries utilizing programming languages and statistics to pull, sort and present data in many forms in the benefit of the organization, people, and/or company.Ģ. In 1980, the development of the relational database gave a new breath to data analysts, which allowed them to use Sequel (SQL) to retrieve data from databases.
Early data analysts use tabulating machines to count data from punch cards. With the development of computers and an ever-increasing move toward technological intertwinement, data analysis began to evolve.
In some other later, but still early forms, data analysis can be seen in censuses, taxing, and other governmental roles across the world. Analyzing data begins with its roots in statistics which, itself, stems into a long history into the period of pyramid building in Egypt.
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