sqlserver数据库创建视图时如何改变字段类型以及查询视图详细内容

时间:2022-06-09 14:53:20
创建或修改视图:

create(alter)  view abc as

select

           l.id as lId,

           cast(l.password as int) as password,                       字符串 ---> int

           cast(l.age as int) as ageInt,                                      字符串 ---> int

           convert(nvarchar(255),p.id) as idString,                   int --->  字符串

           convert(nvarchar(255),p.weight) as weightString,    int --->  字符串

           convert (nvarchar(255) , p.price) as priceString       int --->  字符串

from dbo.login as l , dbo.product as p

;


重点关注cast 和 convert 关键字的用法。


sp_help 视图名字;查询视图详细内容

----------------------------------------------------------------------------------------------------------

下方这些为转载信息:

1、ALTER viewtest1  as 
select NAME ASNAMEINT,AGE AS AGEINT FROM TEST (name保持表中类型)

2、sp_help test1

NAMEINT     varchar     no 50        yes no yesChinese_PRC_CI_AS
AGEINT        int            no 4 10   0    yes (n/a) (n/a) NULL

1、ALTER view test1  as 
select CAST(NAME AS INT) AS NAMEINT,AGE AS AGEINT FROMTEST  (将varchar类型改为int类型)

2、sp_help test1

NAMEINT    int no 4 10   0    yes (n/a) (n/a) NULL
AGEINT       int no 4 10   0    yes (n/a) (n/a) NULL

----------------------------------------------------------------------------------------------------------