MS Access iif语句转换为T-SQL

正在尝试转换access iif语句

IIf(FD.[Sales_Value] = 0, 'Component',
    (IIf(FD.[Lines] = 0,    
        IIf(FD.[Sales_Value] = FD.[Gross_Contribution],
            'Composite', 'N'),
        'N')
    )
) AS Composite,

我现在有这个，但它不喜欢

CASE WHEN FD.[Sales_Value] = 0 THEN 'Component'
ELSE CASE WHEN FD.[Lines] = 0 THEN
        CASE WHEN FD.[Sales_Value] = FD.[Gross_Contribution] THEN 'Composite' ELSE 'N' --END
        ELSE
            'N'
        END 
END
    AS Composite

---

这应该有效，可读性更好：

CASE 
    WHEN FD.[Sales_Value] = 0 THEN 'Component'
    WHEN FD.[Lines] = 0 AND FD.[Sales_Value] = FD.[Gross_Contribution] 
       THEN 'Composite' 
    ELSE 'N'
END
    AS Composite