Update 38-schemaless-opentsdb-telnet.md

docs/en/07-data-in/38-schemaless-opentsdb-telnet.md

@@ -52,7 +52,13 @@ You can use any client that supports the http protocol to access the RESTful int
 ```
 
 ### Insert Example
-- curl --request POST http://127.0.0.1:6041/opentsdb/v1/put/telnet/test --user "root:taosdata" --data-binary "sys.if.bytes.out  1479496100 1.3E0 host=web01 interface=eth0"
-  
-### Query Example with SQL
-- select * from `sys.if.bytes.out` where host="web01" and interface="eth0"
+```bash
+curl --request POST "$TDENGINE_CLOUD_URL/opentsdb/v1/put/telnet/<db_name>?token=$TDENGINE_CLOUD_TOKEN" --data-binary "sys  1479496100 1.3E0 host=web01 interface=eth0"
+```
+
+## Query Example with SQL
+`sys` is the super table name.
+you can filter data by tag, like:`where host="web01"`.
+```bash
+curl -L -d "select * from <db_name>.sys where host=\"web01\"" $TDENGINE_CLOUD_URL/rest/sql/test?token=$TDENGINE_CLOUD_TOKEN
+```