Question

In an SQL statement how does one return a string value dependent on the value in another column?

Language is T-SQL

i want a sub query to return the result of the following pseudo code expression into a new column called Current_YTD

IF(Committed_Date >= '01/04/2011') THEN Current_YTD = 'Y'

Committed_Date is a DateTime type

Answer 1

Assuming SQL Server (appears likely from your question history), you need the CASE statement:

SELECT 
    CASE 
        WHEN Committed_Date >= '01/04/2011' THEN 'Y' 
        ELSE 'N' 
    END AS Current_YTD
FROM YourTable