What is the difference between a primary key and a surrogate key

0 votes
What is the difference between a primary key and a surrogate key?
Sep 19 in Database by Kithuzzz
• 20,660 points
654 views

1 answer to this question.

0 votes
The unique key in your database that you decide best uniquely identifies a record in the table is the main key. All tables should have a primary key because you need to be able to uniquely identify each record if you ever need to change or delete one.

An artificially produced key is known as a surrogate key. They are helpful in situations where your records effectively lack a natural key, such as in Person tables where it is feasible for two persons who share the same birthday to have the same name or log entries where it is possible for two events to occur with the same timestamp.

These are typically implemented as integers in fields that automatically increment or as GUIDs that are generated for each record. Surrogate keys are generally often ID numbers. Surrogate keys are not required for all tables, unlike primary keys. You don't actually need an ID number for the states if you have a database that displays them in America. The state abbreviation could be used as a primary key code.

The surrogate key's main benefit is that it's simple to verify its uniqueness. The biggest drawback is that they are meaningless. The fact that "28" is Wisconsin has no significance. I hope this helps you.
answered Sep 20 by narikkadan
• 37,660 points

Related Questions In Database

0 votes
1 answer

Can you explain what is the difference between UNION and Join?

Hi Sahana,  I got your doubt, Checkout these ...READ MORE

answered May 30, 2019 in Database by sampriti
• 1,120 points
707 views
0 votes
1 answer

What is the difference between SQL, PL-SQL and T-SQL?

SQL SQL is the standard language for relational ...READ MORE

answered Feb 16 in Database by Vaani
• 7,020 points
188 views
0 votes
1 answer

What is the difference between HAVING and WHERE in SQL?

HAVING: It is used to check after the aggregation ...READ MORE

answered Feb 17 in Database by Vaani
• 7,020 points
122 views
0 votes
0 answers

What is the difference between drop table and delete table in SQL Server?

What is the distinction between the following ...READ MORE

Aug 9 in Database by Kithuzzz
• 20,660 points
174 views
0 votes
0 answers

Simple DateTime sql query

How do I query the DateTime database ...READ MORE

Aug 12 in Database by Kithuzzz
• 20,660 points
58 views
0 votes
0 answers

Real life example, when to use OUTER / CROSS APPLY in SQL

With a colleague, I've been researching CROSS/OUTER ...READ MORE

Aug 25 in Database by Kithuzzz
• 20,660 points
71 views
0 votes
0 answers
0 votes
1 answer

SQL Server CASE .. WHEN .. IN statement

Two forms of CASE statements are getting ...READ MORE

answered Feb 8 in Database by Vaani
• 7,020 points
127 views
0 votes
1 answer

What's the difference between VARCHAR and CHAR?

Any Unicode data can be stored in ...READ MORE

answered Sep 12 in Database by narikkadan
• 37,660 points
52 views
0 votes
1 answer

What is the use of a cursor in SQL Server?

Instead of receiving a result set as ...READ MORE

answered Sep 13 in Database by narikkadan
• 37,660 points
85 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP