Question

我的表中有一个列（部门）有4个不同的值：（department1，department2，department3或department4）。我想做的是根据标准将文本转换为其他内容，以便更容易理解。

非常简单地说：

IF departments = "department1" then re-write department1 as Finance
IF departments = "department2" then re-write department2 as HR
IF departments = "department3" then re-write department2 as Service
etc...

然后，部门专栏将如下所示：

departments
-----------
department1
department1
department3
department1
etc..

到

departments
-----------
Finance
Finance
Service
Finance
etc..

我一直在寻找很长一段时间，找不到任何办法，我甚至不确定它是否可能。如果之前有人问过，请道歉。

Answer 1

如果要选择该格式的数据，请执行此操作

select 
case when departments = 'department1' then 'Finance'
     when departments = 'department2' then 'HR'
     when departments = 'department3' then 'Service'
     when departments = 'department4' then '4th dept'
end
from table_name

如果你想更新表

UPDATE table_name
SET     departments =  
    case when departments = 'department1' then 'Finance'
         when departments = 'department2' then 'HR'
         when departments = 'department3' then 'Service'
         when departments = 'department4' then '4th dept'
    end

Answer 2

如果您想要就地更新数据，请使用简单的

update mytable set departments = 'Finance' where departments = 'department1'

如果您想保留数据，只更改select语句返回的内容，请使用case：

select
  case departments
    when 'department1' then 'Finance'

如果列符合条件，则转换列的条目

2 个答案: