如何选择具有相同顺序的值

Question

我有一个问题。

我有一个ProductId产品名列表。

在里面。我有

                  1-A
                  2-B
                  3-C
                  4-D

如果我愿意select * from products where Id IN (1,2,3,4)

我得到B，D，C，A我怎么得到A，B，C，D

Answer 1

使用order by

select * from tablename order by ProductName

Answer 2

您将需要另一个表。

SELECT p.* FROM PRODUCTS p
INNER JOIN 
(
SELECT 3 as id, 1 as ord
union all
SELECT 2 as id, 2  
union all
SELECT 4 as id, 3  
union all
SELECT 1 as id, 4   
) O
on o.id=P.productID
order by o.ord