[GitHub] [spark] dongjoon-hyun commented on a change in pull request #27866: [SPARK-31110][SQL] refine sql doc for SELECT

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dongjoon-hyun commented on a change in pull request #27866: [SPARK-31110][SQL] refine sql doc for SELECT
URL: https://github.com/apache/spark/pull/27866#discussion_r390494429
 
 

 ##########
 File path: docs/sql-ref-syntax-qry-select.md
 ##########
 @@ -1,57 +1,61 @@
 ---
 layout: global
 title: SELECT
-displayTitle: SELECT 
+displayTitle: SELECT
 license: |
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at
- 
+
      http://www.apache.org/licenses/LICENSE-2.0
- 
+
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 ---
 Spark supports a `SELECT` statement and conforms to the ANSI SQL standard. Queries are
-used to retrieve result sets from one or more tables. The following section 
+used to retrieve result sets from one or more tables. The following section
 describes the overall query syntax and the sub-sections cover different constructs
-of a query along with examples. 
+of a query along with examples.
 
 ### Syntax
 {% highlight sql %}
 [ WITH with_query [ , ... ] ]
+select_statement [ { UNION | INTERSECT | EXCEPT } select_statement, ... ]
 
 Review comment:
   `[ ALL | DISTINCT ]` seems to be missed while transition.

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