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

Show the internet protocols, A communication protocol is an agreement which...

A communication protocol is an agreement which specifies a common language two computers use to exchange messages. For instance, a protocol specifies exact format and meaning of ev

Bernstein conditions for detection of parallelism, Bernstein Conditions for...

Bernstein Conditions for Detection of Parallelism For implementation of instructions or block of instructions in parallel, it should be guaranteed that the instructions are ind

Neural network programming using matlab, I need the matlab basics for crea...

I need the matlab basics for creating and configuring a neural network with 2 hidden layers

What is locking, What is Locking? When two users at the same time atte...

What is Locking? When two users at the same time attempt to access the similar data record, this is synchronized by a lock mechanism

Explain grade of service with reference to telephone traffic, With referenc...

With reference to telephone traffic, explain the terms GOS. GOS: in loss systems, the traffic carried through the network is usually lower than the actual traffic offered to

Advantages and disadvantages of shared memory programming, Q. Show Advantag...

Q. Show Advantages and Disadvantages of Shared Memory Programming? Advantages of Shared Memory Programming Data sharing between processes is both rapid and uniform bec

List in a pop-up screen other than full-size stacked list, Can we display a...

Can we display a list in a pop-up screen other than full-size stacked list? Yes, we can show a list in a pop-up screen using the command WINDOW with the additions beginning at

Assembly program, where do i get some sample assembly projects (with coding...

where do i get some sample assembly projects (with coding included)?

Convert, haw to convert context free grammar to regular grammar

haw to convert context free grammar to regular grammar

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