正如您所知道的AS语句,我们可以创建一个包含查询表达式的列。如何将这一列添加到我的表中?
例如:
select
CAST(idwYear AS varchar(20)) + '-' +
CAST((right('00' + ltrim(str(idwMonth)), 2)) AS varchar(20)) + '-' +
CAST(right('00' + ltrim(str(idwDay)), 2) AS varchar(20)) AS finaldate
现在,如何添加最终日期,例如my_table
?
答案 0 :(得分:0)
这就是解决方案。
insert into finaldate
select
CAST(idwYear AS varchar(20)) + '-' +
CAST((right('00' + ltrim(str(idwMonth)), 2)) as varchar(20)) + '-' +
CAST(right('00' + ltrim(str(idwDay)), 2) AS varchar(20))
from
database.dbo.rawdata
为什么我不能做的是我添加了值但不需要值语句
答案 1 :(得分:0)
您可以使用下面的DDL将最终日期添加为computed column:
ALTER TABLE dbo.my_table
ADD finaldate AS
CAST(idwYear AS varchar(20)) + '-'
+ CAST((right('00' + LTRIM(STR(idwMonth)), 2)) AS varchar(20)) + '-'
+ CAST(right('00' + LTRIM(STR(idwDay)), 2) AS varchar(20));