Can a database table be without a primary key?

Posted by bodacydo on Stack Overflow See other posts from Stack Overflow or by bodacydo
Published on 2010-03-25T12:53:55Z Indexed on 2010/03/25 13:03 UTC
Read the original article Hit count: 466

Filed under:

database

Can anyone help me understand if a table in a relational database (such as MySQL) can be without a primary key?

For example, I could have table day_temperature, where I register temperature and time. I don't see the reason to have a primary key for such a table.

Thoughts?

Thanks, Boda Cydo.

Related posts about database

SQL SERVER Retrieve and Explore Database Backup without Restoring Database Idera virtual database

as seen on Dot net Slackers - Search for 'Dot net Slackers'
I recently downloaded Ideras SQL virtual database, and tested it. There are a few things about this tool which caught my attention.My ScenarioIt is quite common in real life that sometimes observing or retrieving older data is necessary; however, it had changed as time passed by. The full database… >>> More
Cloning A Database On The Same Server Using Rman Duplicate From Active Database

as seen on Oracle Blogs - Search for 'Oracle Blogs'
To clone a database using Rman we used to require an existing Rman backup, on 11g we can clone databases using the "from active" database option. In this case we do not require an existing backup, the active datafiles will be used as the source for the clone. In order to clone with the source database… >>> More
cPickle ImportError: No module named multiarray

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm using cPickle to save my Database into file. The code looks like that: def Save_DataBase(): import cPickle from scipy import * from numpy import * a=Results.VersionName #filename='D:/results/'+a[a.find('/')+1:-a.find('/')-2]+Results.AssType[:3]+str(random.randint(0,100))+Results.Distribution+"… >>> More
SQL SERVER – 2008 – Introduction to Snapshot Database – Restore From Snapshot

as seen on SQL Authority - Search for 'SQL Authority'
Snapshot database is one of the most interesting concepts that I have used at some places recently. Here is a quick definition of the subject from Book On Line: A Database Snapshot is a read-only, static view of a database (the source database). Multiple snapshots can exist on a source database and… >>> More
OTN ???? ?????? ???????

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Database ?? Database ??????? Database ?????????? Java WebLogic Server/????????·???? SOA/BPM/????? ???????/???? ID??/?????? ?????EPM/BI EPM/BI ??????? EPM/BI ???? OS/??? ???? ????? MySQL Database ?? ???? ?? ????????? ??? ?? ORACLE MASTER… >>> More

Developer IT

Can a database table be without a primary key? - Developer IT

Can a database table be without a primary key?

database

Related posts about database

SQL SERVER Retrieve and Explore Database Backup without Restoring Database Idera virtual database

Cloning A Database On The Same Server Using Rman Duplicate From Active Database

cPickle ImportError: No module named multiarray

SQL SERVER – 2008 – Introduction to Snapshot Database – Restore From Snapshot

OTN ???? ?????? ???????

Categories cloud