select distinct cast(Id as string) as number
From table 1,
请问这句代码是什么意思呀
select distinct cast(Id as string) as number
From table 1,
请问这句代码是什么意思呀
cast(Id as string)把字段Id的值转换为字符串类型
as number 字段取别名为 number
distinct 结果集去重
话说cast(Id as string)有这种写法??转换为字符串类型不应该是使用char、varchar或nvarchar吗