A primary key is a unique key.Is it clustered or non clustered.
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a primary key hasn't got anything to do with clustering....
a primary key is a unique identifier which is considered the main identifier for an associated set of columns ....
a clustering Key is the set of columns around which you wish to physically order the storage of the table...
to assist in your standard data access requiest....
clustering keys don't have to be unique.
which database system are you considering...
The primary key will have a clustered index in a SQL Server Database if it is created in a Create Table statement
or
if it is created in an Alter Table Statement with Add constraint statement and there is no other clustered index in the table.
if there is another clustered index the primary key will be non-clustered
Kostas Tsigounis
Are keywords to indicate that a clustered or a nonclustered index is created for the PRIMARY KEY or UNIQUE constraint. PRIMARY KEY constraints default to CLUSTERED and UNIQUE constraints default to NONCLUSTERED.
You can specify CLUSTERED for only one constraint in a CREATE TABLE statement. If you specify CLUSTERED for a UNIQUE constraint and also specify a PRIMARY KEY constraint, the PRIMARY KEY defaults to NONCLUSTERED.
run4u
Primary keys are just like any index. If the primary key is clustered then the index is on the same pages as the data. If the PK is non-clustered it will be on separate pages.
For this reason, non-clustered indexes require additional storage space while clustered indexes require little additional storage space. Keep in mind also that clustered index keys are carried on all non-clustered indexes. That is one reason why it is good practice to make clustered index keys as small as possible.
hope this one can help you......
I pose another question, what if you create the table in SQL Server not using SQL but right-clicking in the tables view of a database in Enterprise Manager and create a new database using menus? Then is it clustered or non-clustered.....sorry, I have to ask because it seems as though everyone here is using SQL which is probably more standard but some people use Enterprise Manager
Business Accounts
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by: Ashish_SoftSolPosted on 2003-09-12 at 03:55:11ID: 9344883
It is non-clustered by default.
ashish agarwal