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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.
Reprography In order to disseminate information widely some method of reprography is invariably used. Reprography is the science and practice of copying documents by photograph
explain the bock and pin diagram of 8259 micropocesser
KK manufacturing company is faced with demand for its product in each of the next four periods as shown in Table 1. It must decide upon a production schedule to meet these demands
What are the various mechanisms for implementing I/O operations? a) Program controlled I/O b) Interrupts c) DMA
In this technique, operand field of instruction includes an address and an index register thatcomprises an offset. This addressing scheme is normally used to address the consecutiv
Discuss in detail about Micro computer A microcomputer's CPU is a microprocessor. The microcomputer was originated in late 1970s. The first microcomputer was built around 8-bit
what is system programming? System programming is the activity of implementing and designing SPs. System programs that are the standard component of the s/w of most computer
A given microprocessor has words of 1 byte. What is the smallest and largest integer that can be characterized in the following representations? a) unsigned b) sign- ma
Explain the basic performance equation Ans: The basic performance equation is following T = N * S/ R T => It is processor time required to execute a program N => act
Q. Editor - Tools necessary for assembly language programming? The editor is a program which allows the user to enter and modify as well as store a group of instructions or tex
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