模拟Oracle的desc命令编写的describe，查询表的结构

CREATE proc describe

@table_name Nvarchar(100)

as

select c.name as column_name,

case t.name

when 'numeric' then

t.name+'('+cast(c.precision as varchar(5))+','+cast(c.scale as varchar(5))+')'

when 'char' then

t.name+'('+cast(c.max_length as varchar(5))+')'

when 'varchar' then

t.name+'('+cast(c.max_length as varchar(5))+')'

else t.name

end as type,

case c.is_nullable when 1 then ' '

else 'NOT NULL'

end as nullable

from sys.all_columns as c, sys.types as t

where c.system_type_id=t.system_type_id

and c.object_id=object_id(@table_name)

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