In this article, I am discussing an important pattern in several SQL interview questions, the typical concept of Row Expansion or Unpivoting Data. Unpivoting Data typically means normalizing the data, ...
On 1st Sept 2025, I appeared for my very first interview, and it was truly a memorable experience. The interview was for the Java Full Stack Engineer (FSE) role at Cognizant through their Digital ...
we have a swipe table which keeps track of the employee login and logout timings. 1. Find out the time employee person spent in office on a particular day (office hours = last logout time - first ...
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