等效于Case SQL语句中的IFF

Question

I am trying to convert an access IFF query to an SQL Server query

SELECT blah blah ,
    IIf([stock]![supplier]=[pos]![supplier],"Preferred"," ") AS Preferrednew 
FROM blah blah

In access this will give a value of preferred in a column called Preferrednew where the condition is true.

I have converted the code to..

SELECT blah blah ,
 CASE WHEN ([stock.supplier] = [pos.supplier]), 'test', 'test2' AS [preferrednew]
FROM blah blah

but I get the error

Incorrect syntax near ','

What is the correct format ?

Answer 1

SELECT blah blah ,
    CASE WHEN stock.supplier = pos.supplier THEN 'test'
    ELSE 'test2'
    END AS [preferrednew]
FROM blah blah

Keep in mind that SQL Server 2012+ supports IIF