Sql 使用预定义的值顺序选择列值

我有一个包含这些值的表，我想用可选值显示结果，我还想更改值的顺序，如customer 1、customer 3、customer 2，但它们必须是可选顺序。 客户名称

    CREATE TABLE TEST (
      customername varchar(50)
    );

    INSERT INTO TEST VALUES('CUSTOMER 1');
    INSERT INTO TEST VALUES('CUSTOMER 1');
    INSERT INTO TEST VALUES('CUSTOMER 1');
    INSERT INTO TEST VALUES('CUSTOMER 2');
    INSERT INTO TEST VALUES('CUSTOMER 2');
    INSERT INTO TEST VALUES('CUSTOMER 2');
    INSERT INTO TEST VALUES('CUSTOMER 3');
    INSERT INTO TEST VALUES('CUSTOMER 3');
    INSERT INTO TEST VALUES('CUSTOMER 3');

预期结果：

    CUSTOMER 2
    CUSTOMER 1
    CUSTOMER 3
    CUSTOMER 2
    CUSTOMER 1
    CUSTOMER 3
    CUSTOMER 2
    CUSTOMER 1
    CUSTOMER 3

我试过：

    SELECT  customername
    FROM    TEST
    ORDER BY ROW_NUMBER() OVER ( PARTITION BY customername ORDER BY  customername)

这就回来了,

    CUSTOMER 2
    CUSTOMER 1
    CUSTOMER 3
    CUSTOMER 2
    CUSTOMER 1
    CUSTOMER 3
    CUSTOMER 1
    CUSTOMER 3
    CUSTOMER 2

---

N.B值可以是3,2,1这样的整数，因为上面只是一个示例

您需要一个定义所需顺序的附加表：

create table dict(customername varchar(50), priority int);
insert into dict values
('CUSTOMER 2', 1),
('CUSTOMER 1', 2),
('CUSTOMER 3', 3);

select customername
from test
join dict
using (customername)
order by
    row_number() over (partition by customername),
    priority;

 customername 
--------------
 CUSTOMER 2
 CUSTOMER 1
 CUSTOMER 3
 CUSTOMER 2
 CUSTOMER 1
 CUSTOMER 3
 CUSTOMER 2
 CUSTOMER 1
 CUSTOMER 3
(9 rows)    

---

是否为不同顺序的

定义了任何角色

，或者我们可以假设总是2,3,1？