如何在SQL中移动和转换数据？

作为一个简单的例子，假设我有两个名为Old和New的表。旧表只有一个名为Decision的列，它是一个字符串，只包含“Yes”、“No”或“Maybe”

新桌子是空的。如何从旧表中获取所有数据，对其进行转换，并将其作为整数（或int 0=“N”、1=“Y”和2=“Maybe”）存储在新表中

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谢谢。

我想你会在新桌子上放一个FK

insert into NewTable (Decision)
select case Decision when 'N' then 0 when 'Y' then 1 else 2 end
from OldTable

Table YesNoMaybe
Byte ID PK
Value varchar(10)

0, N
1, Y
2, Maybe

Insert into New
Select ID
From YesNoMaybe 
JOIN Old
  ON Old.Decision = YesNoMaybe.[value]

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我想你会在新桌子上放一个FK

Table YesNoMaybe
Byte ID PK
Value varchar(10)

0, N
1, Y
2, Maybe

Insert into New
Select ID
From YesNoMaybe 
JOIN Old
  ON Old.Decision = YesNoMaybe.[value]

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此外-单语句查询：

create table NewTable as 
select (case Decision when 'N' then 0 when 'Y' then 1 else 2 end) int_col
 from OldTable 
/

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此外-单语句查询：

create table NewTable as 
select (case Decision when 'N' then 0 when 'Y' then 1 else 2 end) int_col
 from OldTable 
/

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@谢谢。现在修好了。@MartinSmith谢谢。现在修好了。