创建 sql 语句以从表中返回信息

Question

我正在创建 sql 查询以从表中返回信息，但我遇到了一个特别的问题。我想返回科罗拉多州的所有城市地区。 查询的实际定义是

Return the names (name10) of all urban areas (in alphabetical order) that are entirely contained 
within Colorado. Return the results in alphabetical order. (64 records)

我使用的表是 tl_2010_us_state10（它存储状态信息）。我想我将在此表中使用 name10 变量，因为它包含所有州的名称。

    Table "public.tl_2010_us_state10"
    Column   |            Type             |                            Modifiers                             
 ------------+-----------------------------+-------------------------------------
  gid        | integer                     | not null default 
  region10   | character varying(2)        | 
  division10 | character varying(2)        | 
  statefp10  | character varying(2)        | 
  statens10  | character varying(8)        | 
  geoid10    | character varying(2)        | 
  stusps10   | character varying(2)        | 
  name10     | character varying(100)      |

然后我有一个显示所有城市信息的表格。再一次，我想我将使用 name10 变量，因为它存储了所有城市区域的名称。

                                      Table "public.tl_2010_us_uac10"
    Column   |            Type             |                           Modifiers                         
------------+-----------------------------+-------------------------------------
 gid        | integer                     | not null default 
 uace10     | character varying(5)        | 
 geoid10    | character varying(5)        | 
 name10     | character varying(100)      |

我在 sql 中写的代码是

 select a.name10 from tl_2010_us_uac10 as a join tl_2010_us_state10 as b where (b.name10 = 'colorado');

但我收到此错误

LINE 1: ...l_2010_us_uac10 as a join tl_2010_us_state10 as b where (b.n...

gid 是主键

Answer 1

您必须有一个内连接的连接条件。然后根据您的排序要求订购。

select a.name10 as urban_area
from tl_2010_us_uac10 as a 
join tl_2010_us_state10 as b 
     on b.gid = a.gid
where b.name10 = 'colorado'
order by a.name10;