Answer Posted / mahesh manam
The main purpose of SURROGATE KEY is:
--> If you want to store the multiple records
for example:
In one general store customer id is primary key ,
If the customer change his address or phone number .
But now our requeriment is like to store all the data along
with old
-->If you are using duplicate records with out using
SURROGATE KEY like as follows:
ID NAME LOC
1 Mahesh Chennai
1 Mahesh Hyderabad
In above case if you are work with any dimmension model it
is not support to use this table. So, we need to maintain
Primary Key in each table.
-->Surrogate key is a key in that table use as a primary
key in the table to do joininng to another
-->Surrogate is very usefull and Quickly
If you are using any huge amount of data and you need to
retrive the queries which is usefull to your bussiness
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