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:command:`sum(expression)` aggregate to return a sum for a set of records
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Projection Exercises
投影练习
Here's a reminder of some of the functions we have seen. Hint: they should be useful for the exercises!
这里提醒一下我们见过的一些功能。提示：它们应该对练习有用！
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:`sum(expression)` 聚合函数，用于计算记录集合的数值总和
:command:`ST_Length(linestring)` returns the length of the linestring
:command:`ST_Length(linestring)` 返回线串的长度
:command:`ST_SRID(geometry)` returns the SRID of the geometry
:command:`ST_SRID(geometry)`返回几何体的 SRID
:command:`ST_Transform(geometry, srid)` converts geometries into different spatial reference systems
:command:`ST_Transform(geometry, srid)`将几何图形转换为不同的空间参考系
:command:`ST_GeomFromText(text)` returns ``geometry``
:command:`ST_GeomFromText(text)`返回 ``geometry``
:command:`ST_AsText(geometry)` returns WKT ``text``
:command:`ST_AsText(geometry)` 返回 WKT 格式的``text``
:command:`ST_AsGML(geometry)` returns GML ``text``
:command:`ST_AsGML(geometry)`返回 GML 格式的``text``
Remember the online resources that are available to you:
请记住您可以使用的在线资源：
https://epsg.io/
https://epsg.io/
Also remember the tables we have available:
当然！我们有以下表可用：
``nyc_census_blocks``
``nyc_census_blocks``
name, popn_total, boroname, geom
name, popn_total, boroname, geom
``nyc_streets``
``nyc_streets``
name, type, geom
name, type, geom
``nyc_subway_stations``
``nyc_subway_stations``
name, geom
name, geom

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String updated in the repository

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
::command:`sum(expression)` 聚合函数，用于计算记录集合的数值总和
2 weeks ago
User avatar xinbo

Translation changed

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
::command:`sum(expression)` 聚合函数，用于对一组记录进行求和并返回计算记录集合的数值总和
3 weeks ago
User avatar None

Suggestion removed during cleanup

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:`sum(expression)`聚合函数用于对一组记录进行求和并返回总和
11 months ago
User avatar xinbo

Translation added

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:`sum(expression)`聚合函数用于对一组记录进行求和并返回总和
11 months ago
User avatar mt:weblate-translation-memory

Suggestion added

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:`sum(expression)`聚合函数用于对一组记录进行求和并返回总和
11 months ago
User avatar None

String added in the repository

  1. postgis-workshop
  2. projection_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
 
11 months ago
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Source string location
../../en/projection_exercises.rst:8
String age
11 months ago
Last updated
2 weeks ago
Source string age
3 years ago
Translation file
postgis-intro/sources/locale/zh_Hans/LC_MESSAGES/projection_exercises.po, string 3