Add truncate_sql to PostgreSQL

adminer/drivers/pgsql.inc.php

@@ -747,6 +747,10 @@ AND typelem = 0"
 		return rtrim($return, ';');
 	}
 
+	function truncate_sql($table) {
+		return "TRUNCATE " . table($table);
+	}
+
 	function trigger_sql($table) {
 		$status = table_status($table);
 		$return = "";

changes.txt

@@ -5,6 +5,7 @@ PostgreSQL: Support binary files in bytea fields
 PostgreSQL: Cast to string when searching using LIKE (bug #325)
 PostgreSQL: Don't treat interval type as number (bug #474)
 PostgreSQL: Fix condition for selecting no rows
+PostgreSQL: Support TRUNCATE+INSERT export
 
 Adminer 4.6.0 (released 2018-02-05):
 Fix counting selected rows after going back to select page