Github user wuchong commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2169#discussion_r68689676
  
    --- Diff: docs/apis/table.md ---
    @@ -873,7 +920,7 @@ val result = tableEnv.sql(
     
     #### Limitations
     
    -The current version of streaming SQL only supports `SELECT`, `FROM`, 
`WHERE`, and `UNION` clauses. Aggregations or joins are not supported yet.
    +The current version of streaming SQL only supports `SELECT`, `FROM`, 
`WHERE`, `UNION` and `EXCEPT` clauses. Aggregations or joins are not supported 
yet.
    --- End diff --
    
    It seems that Stream SQL hasn't  supported `EXCEPT`.


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