Add example showing all relations (#1052)

src/content/doc-surrealql/statements/relate.mdx

@@ -588,6 +588,49 @@ SELECT
 FROM person:tobie;
 ```
 
+The `?` operator on its own can thus be used to see all of the relations that a record has.
+
+```surql
+CREATE person:hermann_hesse, person:abigail, city:calw, book:demian;
+RELATE person:hermann_hesse->wrote->book:demian SET written_in = d'1919-01-01';
+RELATE person:hermann_hesse->born_in->city:calw;
+RELATE person:abigail->likes->person:hermann_hesse;
+
+SELECT 
+	-- all tables in which the record is at `in`
+    ->(?).* AS what_hesse_did,
+	-- all tables in which the record is at `out`
+    <-(?).* AS what_others_did_to_hesse
+FROM person:hermann_hesse;
+```
+
+```surql title="Output"
+[
+	{
+		what_hesse_did: [
+			{
+				id: born_in:k3adylof24a2r5kio8l5,
+				in: person:hermann_hesse,
+				out: city:calw
+			},
+			{
+				id: wrote:ncbo9w0d8t3xd7lvl4dx,
+				in: person:hermann_hesse,
+				out: book:demian,
+				written_in: d'1919-01-01T00:00:00Z'
+			}
+		],
+		what_others_did_to_hesse: [
+			{
+				id: likes:6gubmldm14gzasoyypay,
+				in: person:abigail,
+				out: person:hermann_hesse
+			}
+		]
+	}
+]
+```
+
 Parentheses can be used at each point of a graph query. The example below includes `person` records (authors) connected to `book` records by the `wrote` table. As both the `person` and `book` tables have fields that can be useful when filtering, they can be isolated with parentheses at this point of the graph query in order to filter using the `WHERE` clause.
 
 ```surql