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SQL Server 2005
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Implementing Surrogate Key
Implementing Surrogate Key
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Shadab Shah
Shadab Shah
Posted Thursday, August 02, 2012 3:49 AM
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How to implement surrogate key ?
Post #1339037
ChrisM@Work
ChrisM@Work
Posted Thursday, August 02, 2012 6:35 AM
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shahsn11 (8/2/2012)
How to implement surrogate key ?
CREATE TABLE MyTable (
MyTableID INT IDENTITY(1,1) PRIMARY KEY,
.
.
.
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”
- Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read
this article
.
Understanding and using APPLY, (I)
and
(II)
Paul White
Hidden RBAR: Triangular Joins
/
The "Numbers" or "Tally" Table: What it is and how it replaces a loop
Jeff Moden
Exploring Recursive CTEs by Example
Dwain Camps
Post #1339095
Shadab Shah
Shadab Shah
Posted Thursday, August 02, 2012 7:08 AM
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So does that mean that Surrogate Key is only the concept. And in lay man terms(i.e. mine) can we say that PK=Surrogate Key.
If the above is true that what is the difference between Pk and surrogate key.
Post #1339128
Koen Verbeeck
Koen Verbeeck
Posted Thursday, August 02, 2012 7:18 AM
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shahsn11 (8/2/2012)
So does that mean that Surrogate Key is only the concept. And in lay man terms(i.e. mine) can we say that PK=Surrogate Key.
If the above is true that what is the difference between Pk and surrogate key.
A surrogate key is by defination meaningless, aka a simple integer with no meaning attached which serves as a primary key. A primary key is a combination of one or more columns that uniquely identify a row. So it's possible this is for example a customerID, such as AW001578. This has meaning, as it is customer number 1578 of the Adventure Works company. Or it can be an emailaddress to uniquely identify a person. This is often called the "natural key".
So, a surrogate key is a primary key, but a primary key is not necessarily a surrogate key.
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Post #1339139
ChrisM@Work
ChrisM@Work
Posted Thursday, August 02, 2012 7:25 AM
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shahsn11 (8/2/2012)
So does that mean that Surrogate Key is only the concept. And in lay man terms(i.e. mine) can we say that PK=Surrogate Key.
If the above is true that what is the difference between Pk and surrogate key.
A PK is a means of uniquely identifying a row. It's either an attribute(s) of the data (natural key), or it can be generated by the RDBMS (surrogate key). Here's a nice
article
to get you started.
“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.”
- Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read
this article
.
Understanding and using APPLY, (I)
and
(II)
Paul White
Hidden RBAR: Triangular Joins
/
The "Numbers" or "Tally" Table: What it is and how it replaces a loop
Jeff Moden
Exploring Recursive CTEs by Example
Dwain Camps
Post #1339149
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