Question

My table contains the following fields, Name,Age,Salary,Phone,DOB. Based on a settings table, I have to select only some fields. For example, I say in settings, only Name and Phone is required. How can I do it using stored procedure ?

EDIT :

Which one is good.

1. Select the required fields from the table.
2. Select all columns and in ASP.NET page, use .Visibility property to hide or show columns

Answer 1

SQL is a fixed column language: columns can not be added or removed “on the fly”

You would need to use dynamic SQL to build a SELECT statement, or use IF statements to execute different ones. However, you open up caching, security and injection issues.

Personally, I’d ignore columns in the client code and have a simple, single efficient SQL query. The contract or API between SQL Server and the client should be static and predictable. If the settings table is applied in SQL Server, your client doesn’t know what columns to expect. If your client does know, then it can ignore them.

After your edit, option 2, kind of.

But the data should be removed before being rendered in the page.

Keep it simple: don’t try to optimise anything yet