Get a value from a function that returns table

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Hello guys.
I want declare a variable and set one of results the following function

USE AdventureWorks
GO
CREATE FUNCTION UDF_TABLE_COLUMNS
(
   @SCHEMA VARCHAR(50),
   @TABLENAME VARCHAR(50)
   
)
RETURNS TABLE
AS
   RETURN
     SELECT COLUMN_NAME 
     FROM INFORMATION_SCHEMA.COLUMNS
     WHERE TABLE_NAME=@TABLENAME 
     AND TABLE_SCHEMA=@SCHEMA

The system view INFORMATION_SCHEMA have not any primary key.
how can i use one of the values of the function.
Is there any index or array?

Posted 6-Jan-13 1:54am

saeed.zarei

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Zoltán Zörgő 6-Jan-13 8:03am

You usually don't need a primary key for that. Actually it depends for what you want to "use" the result.

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Wendelius · Answer 1 · 2013-01-06T02:10:00

Views basically never have a primary key, the underlying tables have. Also note that INFORMATION_SCHEMA is not a view, it's a schema. The COLUMNS in that schema is a view.

The Columns view you're querying is a logical representation of columns in tables so if you pass the schema name and the table name as a parameter and query using those parameters you get all the columns for the table at hand.

The result sets in SQL do not have any indexers etc. However if you store the results let's say in a datatable, you can use indexer to access different rows. However, you didn't explain why would you need an indexer.