如何用SQL语句查询一个数据表所有字段的类型

用SQL语句查询一个数据表所有字段的类型可以参考下面的代码：

SELECT

name AS column_name,TYPE_NAME(system_type_id) AS column_type,

max_length,is_nullable

FROM sys.columns

WHERE object_id=OBJECT_ID(N'Address')

扩展资料：

SQL语句

创建索引：create [unique] index idxname on tabname(col…。)

增加列：Alter table table_name add column_name column_type [default 默认值]--在表中增加一列，[]内的内容为可选项

删除索引：drop index idxname on tabname

参考资料来源：百度百科-结构化查询语言

oracle 的话,用PL/SQL Developer的话,邮件菜单中有个view选项,可以查看column的类型,限制条件,keys值
sql的话试下 desc [table name]

select a.name,b.name from sys.columns as a join sys.types as b
on a.system_type_id=b.system_type_id
where object_id=(select object_id from sys.tables where name='表的名字')

用exec sp_help '表名'

SELECT
name AS column_name,TYPE_NAME(system_type_id) AS column_type,
max_length,is_nullable
FROM sys.columns
WHERE object_id=OBJECT_ID(N'Address')