HTHou commented on a change in pull request #2088:
URL: https://github.com/apache/iotdb/pull/2088#discussion_r528559974
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File path: docs/UserGuide/Operation Manual/DML Data Manipulation Language.md
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@@ -169,31 +169,38 @@ select count(status) from root.ln.wf01.wt01;
| 4 |
-##### Count Points By Level
+##### Aggregation By Level
-Level could be defined to show count the number of points of each node at the
given level in current Metadata Tree.
-
-This could be used to query the number of points under each device.
-
-The SQL statement is:
+**Aggregation by level statement** is used for aggregating upon specific
hierarchical level of timeseries path.
+For all timeseries path, by convention, "level=0" represents *root* level.
Review comment:
```suggestion
For all timeseries paths, by convention, "level=0" represents *root* level.
```
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