得到SQL数据库中所有表字段及字段中文描述
SQL2000 写法：
select table_name= ( case when t_c.column_id=1 then t_o.name else '' end ), column_id=t_c.column_id, column_name=t_c.name, type=t.name, max_length=t_c.max_length, precision=isnull(t_c.precision,0), scale=isnull(t_c.scale,0), is_identity=case when t_c.is_identity=1 then '√' else '' end, is_primary= ( case when exists ( select 1 from sys.indexes i,sys.index_columns ic,sys.objects o where o.type='PK' and o.name=i.name and i.index_id=ic.index_id and i.object_id=ic.object_id and ic.column_id=t_c.column_id and o.parent_object_id=t_c.object_id ) then '√' else '' end ), is_nullable=case when t_c.is_nullable=1 then '√' else '' end, default_value=isnull(c.definition,''), description=isnull(e.value,''), fk_column_name=isnull(f_c.name,''), fk_table_name=isnull(f_o.name,'')from sys.columns t_c inner join sys.objects t_o on t_c.object_id=t_o.object_id left join sys.types t on t.system_type_id=t_c.system_type_id and t.user_type_id=t_c.user_type_id left join sys.default_constraints c on c.object_id=t_c.default_object_id and c.parent_object_id=t_c.object_id and c.parent_column_id=t_c.column_id left join sys.extended_properties e on e.major_id=t_c.object_id and e.minor_id=t_c.column_id left join ( select parent_object_id,referenced_object_id,column_id=min(key_index_id) from sys.foreign_keys group by parent_object_id,referenced_object_id )f on f.parent_object_id=t_c.object_id and f.column_id=t_c.column_id left join sys.columns f_c on f_c.object_id=f.referenced_object_id and f_c.column_id=f.column_id left join sys.objects f_o on f_o.object_id=f.referenced_object_idwhere t_o.type='U' and t_o.name<>'sysdiagrams' order by t_o.name,t_c.column_id
