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Category Archives: Computer Subject

Consider below simple table:  Name Salary --------------- abc 100000 bcd 1000000 efg 40000 ghi 500000 How to find the employee whose salary is second highest.… Read More
Circuit Switching Packet Switching In-circuit switching has there are 3 phases: i) Connection Establishment. ii) Data Transfer. iii) Connection Released. In Packet switching directly data transfer takes place.… Read More
Which of the following is public IP address ? (A) 10.15.14.12 (B) 192.168.52.62 (C) 172.32.1.1 (D) None of the Above Answer: (C) Explanation: Range of… Read More
If subnet mask 255.255.255.224, which of the following will be Direct Broadcast address ? (A) 202.15.19.127 (B) 202.15.19.63 (C) Both a and b (D) None… Read More
The difference between the having and where clause in SQL is that the where clause cannot be used with aggregates, but the having clause can. The… Read More
Let us consider below table. Name Section abc CS1 bcd CS2 abc CS1 In the above table, we can find duplicate row using below query.… Read More
Multi threading-It is a process of multiple threads executes at same time. Many operating systems support kernel thread and user thread in a combined way.… Read More
Two schedules S1 and S2 are said to be view-equivalent if below conditions are satisfied :  1) Initial Read If a transaction T1 reading data item… Read More
In an operating system that uses paging for memory management, a page replacement algorithm is needed to decide which page needs to be replaced when… Read More
According to Chomsky hierarchy, grammar is divided into 4 types as follows:  Type 0 is known as unrestricted grammar. Type 1 is known as context-sensitive… Read More
Entity-Relationship (ER) Diagram is a diagrammatic representation of data in databases, it shows how data is related.  Note: This article is for those who already… Read More
Lexical Analysis is the first phase of the compiler also known as a scanner. It converts the High level input program into a sequence of… Read More
DNS is an application layer protocol. All application layer protocols use one of the two transport layer protocols, UDP and TCP. TCP is reliable and… Read More
Mean is average of a given set of data. Let us consider below example  These eight data points have the mean (average) of 5:    … Read More
Finite Automata(FA) is the simplest machine to recognize patterns. The finite automata or finite state machine is an abstract machine that has five elements or… Read More

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