What are primary keys and foreign keys, Computer Engineering

Assignment Help:

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.

 


Related Discussions:- What are primary keys and foreign keys

Explain bus interface unit, Q. Explain Bus Interface Unit? BIU (Bus Int...

Q. Explain Bus Interface Unit? BIU (Bus Interface Unit) mainly interacts with system bus. It executes nearly all the activities relating to fetch cycle like:  Computing

What are the events used for page headers and footers, What are the events ...

What are the events used for page headers and footers? The events TOP-OF-PAGE and END-OF-PAGE are used for pager headers and footers.

Cache memories - computer architecture, Cache Memories - computer architect...

Cache Memories - computer architecture: Speed of the primary memory is very low in comparison with the speed of processor For well performance, the processor can't spend

Kirchoff''s laws, i want to make an assignment about kirchoff''s law

i want to make an assignment about kirchoff''s law

Software estimation, Software Estimation The statement of scope helps t...

Software Estimation The statement of scope helps the planner to established estimates using one or more method which fail into two wide categories: empirical modeling and decom

Which device changes from serial data to parallel data, Which device change...

Which device changes from serial data to parallel data ? Ans. Demultiplexer is the device that changes from serial data to parallel data. Demultiplexer takes data in from on

Find resolution & volts of a 2-digit BCD D/A converter, A 2-digit BCD D/A c...

A 2-digit BCD D/A converter is a weighted resistor type with E R = 1 Volt, with R = 1M? , R f = 10K? . Find resolution in Percent and Volts. Ans. Resolution = 1/2 2 = 0.25 vo

Explain the access methods used in lans, Explain the access methods used in...

Explain the access methods used in LANs. Access methods utilized in LAN: i. Switched access: this is used in LANs which are assigned around CBXs. Electronic switching

Find max conversion time of 6-bit dual slope A/D converter, A 6-bit Dual Sl...

A 6-bit Dual Slope A/D converter uses a reference of -6V and a 1 MHz clock. It uses a fixed count of 40 (101000). Find Maximum Conversion Time.         Ans. The time T 1 specifie

Experiment with neural network, Assignment 3.b: Experiment with Neural Netw...

Assignment 3.b: Experiment with Neural Network Background: In this assignment, you will experiment with neural network for solving different types of practical problems. Y

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd