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Mastering PostGIS

You're reading from   Mastering PostGIS Modern ways to create, analyze, and implement spatial data

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781784391645
Length 328 pages
Edition 1st Edition
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Authors (4):
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George Silva George Silva
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George Silva
 Mikiewicz Mikiewicz
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Mikiewicz
Michal Mackiewicz Michal Mackiewicz
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Michal Mackiewicz
 Nycz Nycz
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Nycz
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Toc

Table of Contents (9) Chapters Close

1. Importing Spatial Data FREE CHAPTER 2. Spatial Data Analysis 3. Data Processing - Vector Ops 4. Data Processing - Raster Ops 5. Exporting Spatial Data 6. ETL Using Node.js 7. PostGIS – Creating Simple WebGIS Applications 8. PostGIS Topology 9. pgRouting

Exporting data using \COPY in psql


When we were importing data, we used the psql \COPY FROM command to copy data from a file to a table. This time, we'll do it the other way round - from a table to a file - using the \COPY TO command.

\COPY TO can not only copy a full table, but also the results of a SELECT query, and that means we can actually output filtered sub datasets of the source tables.

Similarly to the method we used to import, we can execute \COPY or COPY in different scenarios: We'll use psql in interactive and non-interactive mode, and we'll also do the very same thing in PgAdmin.

Note

It is worth remembering that COPY can only read/write files that can be accessed by an instance of the server, usually files that reside on the same machine as the database server.

For detailed information on \COPY syntax and parameters, type:

\h copy

Exporting data in psql interactively

In order to export the data in interactive mode, we first need to connect to the database using psql:

psql -h localhost...
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