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:command:`sum(expression)` aggregate to return a sum for a set of records
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Geometry Exercises
几何练习
Here's a reminder of all the functions we have seen so far. They should be useful for the exercises!
以下是我们到目前为止看到的所有函数的提醒。它们应该对练习有所帮助！
: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:`count(expression)` aggregate to return the size of a set of records
:command:`count(expression)`聚合函数，用于返回记录集的条目总数
:command:`ST_GeometryType(geometry)` returns the type of the geometry
:command:`ST_GeometryType(geometry)` 返回几何图形的类型
:command:`ST_NDims(geometry)` returns the number of dimensions of the geometry
:command:`ST_NDims(geometry)` 返回几何图形的维数
:command:`ST_SRID(geometry)` returns the spatial reference identifier number of the geometry
:command:`ST_SRID(geometry)` 返回几何图形的空间参考标识号
:command:`ST_X(point)` returns the X ordinate
:command:`ST_X(point)` 返回点的 X 坐标
:command:`ST_Y(point)` returns the Y ordinate
:command:`ST_Y(point)` 返回点的 Y 坐标
:command:`ST_Length(linestring)` returns the length of the linestring
:command:`ST_Length(linestring)` 返回线串的长度
:command:`ST_StartPoint(geometry)` returns the first coordinate as a point
:command:`ST_StartPoint(geometry)` 返回第一个坐标作为一个点
:command:`ST_EndPoint(geometry)` returns the last coordinate as a point
:command:`ST_EndPoint(geometry)` 返回最后一个坐标作为一个点
:command:`ST_NPoints(geometry)` returns the number of coordinates in the linestring
:command:`ST_NPoints(geometry)` 返回Linestring中坐标的数量
:command:`ST_Area(geometry)` returns the area of the polygons
:command:`ST_Area(geometry)` 返回多边形的面积
:command:`ST_NRings(geometry)` returns the number of rings (usually 1, more if there are holes)
:command:`ST_NRings(geometry)` 返回环的数量（通常为1，如果有孔则更多）
:command:`ST_ExteriorRing(polygon)` returns the outer ring as a linestring
:command:`ST_ExteriorRing(polygon)` 返回多边形的外环作为线串
:command:`ST_InteriorRingN(polygon, integer)` returns a specified interior ring as a linestring
:command:`ST_InteriorRingN(polygon, integer)` 返回指定的多边形内部环作为线串
:command:`ST_Perimeter(geometry)` returns the length of all the rings
:command:`ST_Perimeter(geometry)` 返回所有环的长度

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User avatar xinbo

Translation changed

  1. postgis-workshop
  2. geometries_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
a month ago
User avatar xinbo

Translation changed

  1. postgis-workshop
  2. geometries_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。
a year ago
User avatar xinbo

Translation changed

  1. postgis-workshop
  2. geometries_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:`sum(expression) `聚合函数，返回用于对一组记录的进行求和并返回总和。
a year ago
User avatar xinbo

Contributor joined

  1. postgis-workshop
  2. geometries_exercises
  3. Chinese (Simplified)
Contributor joined a year ago
User avatar zcw5

Translation added

  1. postgis-workshop
  2. geometries_exercises
  3. Chinese (Simplified)
:command:`sum(expression)` aggregate to return a sum for a set of records
:command:sum(expression) 聚合函数，返回一组记录的总和
a year ago
User avatar None

String updated in the repository

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