Add all missing options to the Import/Export Data functionality, and update the syntax of the COPY command to align with the latest standards. #8583

Updated documentation.

Add support for exporting table data based on a custom query. #8681

Update empty images.

Author: akshay-joshi

docs/en_US/export_data_using_query.rst

@@ -0,0 +1,91 @@
+.. _export_data_using_query:
+
+***************************************
+`Export Data Using Query Dialog`:index:
+***************************************
+
+Use the *Export Data Using Query* dialog to copy data to a file.
+
+The *Export Data Using Query* dialog organizes the export of data through the
+*General*, *Options* and *Query* tabs.
+
+.. image:: images/export_query_general.png
+    :alt: Export data using query dialog general tab
+    :align: center
+
+Use the fields in the *General* tab to specify export preferences:
+
+* Enter the name of the target file in the *Filename* field.
+  Optionally, select the *Browse* icon (ellipsis) to the right to navigate
+  into a directory and select a file.
+
+* Use the drop-down listbox in the *Format* field to specify the file type.
+  Select:
+
+  * *binary* for a .bin file.
+  * *csv* for a .csv file.
+  * *text* for a .txt file.
+
+* Use the drop-down listbox in the *Encoding* field to specify the type of
+  character encoding.
+
+.. image:: images/export_query_options.png
+    :alt: Export data using query dialog options tab
+    :align: center
+
+* Use the fields in the *Options* tab to specify additional information:
+
+   * Move the *Header* switch to the *Yes* position to include the table header
+     with the data rows. If you include the table header, the first row of the
+     file will contain the column names.
+   * If you are exporting data, specify the delimiter that will separate the
+     columns within the target file in the *Delimiter* field. The separating
+     character can be a colon, semicolon, a vertical bar, or a tab.
+   * Specify a quoting character used in the *Quote* field. Quoting can be
+     applied to string columns only (i.e. numeric columns will not be quoted)
+     or all columns regardless of data type. The character used for quoting can
+     be a single quote or a double quote.
+   * Specify a character that should appear before a data character that matches
+     the *QUOTE* value in the *Escape* field.
+   * Use the *NULL String* field to specify a string that will represent a null
+     value within the source or target file.
+
+Click the *Query* tab to continue.
+
+.. image:: images/export_query.png
+    :alt: Export data using query dialog query tab
+    :align: center
+
+Use the fields in the *Query* tab to write the query that will be exported:
+
+* Use the *Export Data Query* field to specifies A SELECT, VALUES, INSERT, UPDATE,
+  DELETE, or MERGE command whose results are to be copied .
+
+* Use *Force Quote columns* field to forces quoting to be used for all non-NULL
+  values in each specified column. NULL output is never quoted. This is a creatable
+  select control. If you would like to quote all columns then provide only '*' in
+  the field.
+
+After completing the *Export Data Using Query* dialog, click the *OK* button to
+perform the export. pgAdmin will notify you when the background
+process completes:
+
+.. image:: images/export_query_complete.png
+    :alt: Export data using query completion notification
+    :align: center
+
+
+Use the *View Processes* button on the notification to open the *Process
+Watcher* and review detailed information about the execution of the command
+that performed the export:
+
+Use the **End Process** button to end the Export process.
+
+.. image:: images/export_query_pw.png
+    :alt: Export data using query process watcher
+    :align: center
+
+.. note:: If you are running *pgAdmin* in *Server Mode* you can click on the |sm_icon| icon in the process watcher window to open the file location in the Storage Manager. You can use the :ref:`Storage Manager <storage_manager>` to download the exported file on the client machine .
+
+
+.. |sm_icon| image:: images/sm_icon.png