用Sql语句查找表结构【sqlserver版】

declare @table_name as varchar(max)
set @table_name = '你要查找的表名'
select  sys.columns.name, sys.types.name as datatype, sys.columns.max_length, sys.columns.is_nullable,
    (select count(*) from sys.identity_columns where sys.identity_columns.object_id = sys.columns.object_id and sys.columns.column_id = sys.identity_columns.column_id) as is_identity ,
    (select value from sys.extended_properties where sys.extended_properties.major_id = sys.columns.object_id and sys.extended_properties.minor_id = sys.columns.column_id) as description
    from sys.columns, sys.tables, sys.types where sys.columns.object_id = sys.tables.object_id and sys.columns.system_type_id=sys.types.system_type_id and sys.tables.name=@table_name
and sys.types.name<>'sysname'
order by sys.columns.column_id