[FLINK-15242] Add doc to introduce ddls or dmls supported by sql cli

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.10.0
• Component/s: Documentation, Table SQL / Client
• Assignee: Unassigned
• Reporter: Terry Wang
• Created: 13/Dec/19 08:33
• Updated: 29/Apr/21 08:31
• Resolved: 29/Apr/21 08:31

Description

Now in the document of sql client
https://ci.apache.org/projects/flink/flink-docs-master/dev/table/sqlClient.html, there isn't a part to introduce the ddls/dmls in a whole story. We should complete it before the 1.10 release.