Mysql sql列格式

只是一个简单的问题

在MySQL中，如何将数值显示为字符串等价项

所以

所以如果我有像

SELECT object_name, object_status where object_status > 0

这件事又回来了

object#1, 1
object#2, 2
object#3, 1
object#4, 3

但我想让它展示出来

object#1, New
object#2, Old
object#3, New
object#4, Cancelled

---

提前感谢KS

您可以在这方面使用

案例

SELECT object_name,         
        CASE object_status 
            WHEN 1 THEN 'New'
            WHEN 2 THEN 'Old'
            WHEN 3 THEN 'Cancelled'
            ELSE NULL
        END status
where object_status > 0

或

---

您可以创建一个新的映射表并将这两个表连接在一起。新表将有两列—一列表示对象状态，另一列表示名称。那就加入这两个

SELECT s.object_name, sm.StatusName
FROM Status s
INNER JOIN StatusMapping sm on s.object_status = sm.object_status
WHERE s.object_status > 0

---

这将允许您在不更改查询的情况下根据需要添加新映射。

您总是比我快；）干杯，伙计们，就是这个！您最好改进您的模式并创建一个映射表。然后，您只需要连接，而不需要使用case语句等减慢查询速度。

SELECT object_name,         
        CASE 
            WHEN object_status = 1 THEN 'New'
            WHEN object_status = 2 THEN 'Old'
            WHEN object_status = 3 THEN 'Cancelled'
            ELSE NULL
        END status
where object_status > 0

SELECT object_name, 
 case object_status when 1 then 'New' 
  when 2 then 'Old' 
  when 3 then 'Cancelled' end as status
from myTable
where object_status > 0

SELECT s.object_name, sm.StatusName
FROM Status s
INNER JOIN StatusMapping sm on s.object_status = sm.object_status
WHERE s.object_status > 0