API/Queries/Attributes.md

@@ -573,6 +573,38 @@ List only those modules which have entites attached:
 }
 ```
 
+# Distinct
+
+Set to 1 to automatically generate a "group_by" clause based on the selection.
+
+## Restrictions
+
+The only values allowed are `0` or `1`.
+
+## Examples
+
+`POST /data/system/module/query`
+
+```json
+{
+  "attrs": {
+    "join": "system__entity__module",
+    "columns": "me.name",
+    "+select": [
+      {
+        "count": "system__entity__module.id",
+        "-as" : "entity_count"
+      }
+    ],
+    "+as": [
+      "entity_count"
+    ],
+    "distinct" : 1
+  }
+}
+```
+
+This will add `GROUP BY me.name` to the query.
 
 # Permitted Column Names