Update 03-opentsdb-telnet.mdx

docs/en/07-develop/03-insert-data/03-opentsdb-telnet.mdx

@@ -31,7 +31,7 @@ For example:
 ```txt
 meters.current 1648432611250 11.3 location=California.LosAngeles groupid=3
 ```
-
+- The defult child table name is generated by rules.You can configure smlChildTableName in taos.cfg to specify chile table names, for example, `smlChildTableName=tname`. You can insert `meters.current 1648432611250 11.3 tname=cpu1 location=California.LosAngeles groupid=3` and the cpu1 table will be automatically created. Note that if multiple rows have the same tname but different tag_set values, the tag_set of the first row is used to create the table and the others are ignored.
 Please refer to [OpenTSDB Telnet API](http://opentsdb.net/docs/build/html/api_telnet/put.html) for more details.
 
 ## Examples
@@ -79,3 +79,6 @@ taos> select tbname, * from `meters.current`;
  t_7e7b26dd860280242c6492a16... | 2022-03-28 09:56:51.250 |              12.600000000 | 2       | California.SanFrancisco               |
 Query OK, 4 row(s) in set (0.005399s)
 ```
+## Query Examples
+If you want query the data of `location=California.LosAngeles groupid=3`，here is the query sql：
+select * from `meters.voltage` where location="California.LosAngeles" and groupid=3