Dynamic fields in SQL Server

Question

How do you create dynamic fields in a SQL Server table? I'd like to add this to the create table command:

isDeleted = CASE WHEN DeleteDate is null THEN 0 ELSE 1

Answer 1

You're looking to create a computed column .

CREATE TABLE dbo.YourTable (
    ...
    isDeleted AS CASE WHEN DeleteDate IS NULL THEN 0 ELSE 1 END 
);

Answer 2

I'm not 100% sure what you mean by dynamic field, but I think this is what you're asking for:

SELECT    MyTable.Foo,
          CASE WHEN MyTable.Foo = "FOO" THEN
              0
          ELSE
              1
          END AS isDeleted
FROM      MyTable