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我如何IF...THEN在SQL SELECT声明中执行？

例如:

SELECT IF(Obsolete = 'N' OR InStock = 'Y' ? 1 : 0) AS Saleable, * FROM Product

我需要根据某种优先级从表中选择数据,如下所示:

select product, price from table1 where project = 1

-- pseudo: if no price found, do this:
select product, price from table1 where customer = 2

-- pseudo: if still no price found, do this:
select product, price from table1 where company = 3

也就是说,如果我找到3个基于价格的产品project = X,我不想选择customer = Y.我只想返回结果3行并完成.

你怎么在SQL中做这样的事情？对pseudo-if使用某种CASE语句？做工会还是其他聪明的事情？

编辑:我正在使用MS SQL.

谢谢!