"client_encoding" : string | Character encoding for the client side, e.g.
UTF8 or SQL_ASCII .
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"server_encoding" : string | Character encoding for the server side as determined when the
database was created, e.g. UTF8 or SQL_ASCII
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"DateStyle" : string | Date parsing/display, e.g. ISO, DMY
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"TimeZone" : string | Default timezone used by the database, e.g. localtime
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"standard_conforming_strings" : string | When on, backslashes in strings must not be escaped any longer
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"session_authorization" : string | Displays the authorisationrole which the current session runs under
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"is_superuser" : string | Indicates if the current authorisationrole has database-superuser
privileges
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"integer_datetimes" : string | Reports wether the database supports 64-bit-integer dates and times
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"server_version" : string | Shows the server version, e.g. 8.3.3
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