top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration

Facebook Login
Site Registration

What are the properties of the Relational tables?

+1 vote
171 views

Explain about the properties of the Relational tables

posted Nov 22, 2014 by Balu

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

2 Answers

0 votes

SQL server supports following locks

  • Shared lock
  • Update lock
  • Exclusive lock

Shared lock

Shared Lock allows simultaneous access of record by multiple Select statements.
Shared Lock blocks record from updating and will remain in queue waiting while record is accessed for reading.
If update process is going on then read command will have to wait until updating process finishes.

Update locks

This lock is used with the resources to be updated.

Exclusive locks

This kind of lock is used with data modification operations like update, insert or delete.

answer Nov 22, 2014 by Vrije Mani Upadhyay
0 votes

Relational tables have six properties:
1. Values are atomic.
2. Column values are of the same kind.
3. Each row is unique.
4. The sequence of columns is insignificant.
5. The sequence of rows is insignificant.
6. Each column must have a unique name.

answer Nov 22, 2014 by Manikandan J
Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...