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What are primary keys and foreign keys?
Primary keys are the unique identifiers for every row. They must have unique values and cannot be null. Due to their significance in relational databases, Primary keys are the most fundamental of all keys and constraints. A table can have only one Primary key. Foreign keys are both a method of ensuring data integrity and a manifestation of the relationship among tables.
Q. Writing down your own Interrupt Service Routines? Here are a few rules which should be kept in mind while writing down your own Interrupt Service Routines: 1. Use Int 21
Truth table of NAND and NOR can be made from NOT (A AND B) and NOT (A OR B) correspondingly. Exclusive OR (XOR) is a special gate whose output is one only if two inputs aren't equa
Illustrate the role of World Wide Web into the field of e-commerce. In the 1990 year, the advent of the World Wide Web upon the Internet represented a turning point into e-com
What is an "on input filed" statements? ON INPUT The ABAP/4 module is known as only if a field having the Value other than the initial Value. This initial Value is explain
Associativity of Connectives : Here brackets are very important in order to tell us where to perform calculations in arithmetic and logic. By using these brackets we evaluate
how to more effective our project to css effect???
A dialog box such as a File menu that have one command until it is clicked when a number of dissimilar commands "drop-down."
What is an I/O Interface? Input-output interface provides a method for transferring binary information among internal storage, like memory and CPU registers, and external I/O d
Determine the basic Machine language instructions Machine language instructions and data are in terms of 0s and 1s and are stored in the memory. It isn't possible to distinguis
What is IPC? What are the various schemes available? The term IPC (Inter-Process Communication) explains various ways by which different process running on some operating syste
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