VB.net Get a count of the number of primary keys in a SQL table

Hi

I use the following code to get the primary key for a SQL table. If the table has more than one primary key
how do I get a count of the number of primary keys? Thanks

            sSQL = "SELECT column_name "
                sSQL = sSQL & "FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE "
                sSQL = sSQL & "WHERE OBJECTPROPERTY(OBJECT_ID(constraint_name), 'IsPrimaryKey') = 1"
                sSQL = sSQL & "AND table_name = '" & oTableName & "'"

                Dim connection As New SqlConnection(Globals.ThisAddIn.oRIGHT.lblConnectionString.Text)
                Dim cmd As New SqlCommand(sSQL, connection)
                connection.Open()
                Get_Primary_Key = cmd.ExecuteScalar().ToString
                connection.Close()
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
A table can only have one primary key.

More than one column can be engaged in the primary key, but there will only be one primary key in the table.
0
ste5anSenior DeveloperCommented:
E.g.

 
USE AdventureWorks2012;

SELECT  KC.name ,
        C.name 
FROM    sys.schemas S
        INNER JOIN sys.tables T ON T.schema_id = S.schema_id
        INNER JOIN sys.key_constraints KC ON KC.parent_object_id = T.object_id
        INNER JOIN sys.index_columns IC ON IC.object_id = T.object_id
                                           AND IC.index_id = KC.unique_index_id
        INNER JOIN sys.columns C ON C.object_id = T.object_id
                                    AND C.column_id = IC.column_id
WHERE   S.name = 'Production'
        AND T.name = 'ProductInventory'
	AND KC.type = 'PK';

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks for clarifying that a table can only one primary key. Also thanks for the code
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.