Github user liuyu000 commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/1001#discussion_r106326367
--- Diff: docs/sql_reference/src/asciidoc/_chapters/sql_statements.adoc ---
@@ -7784,6 +7784,120 @@ SELECT (SELECT a FROM t1) FROM t GROUP BY (SELECT a
FROM t1);
SELECT a+1 FROM t GROUP BY 1+a;
```
+=======
+[[with_clause_syntax]]
+=== Syntax Description of WITH clause
+
+WITH clause, known as Common Table Expressions (CTEs) or subquery
factoring clause, was introduced in the SQL-99 standard and has been
implemented into Trafodion R2.1.
+
+For a complex expression which is referenced multiple times within the
body of a SELECT statement, the WITH clause assigns it an alias. The alias is
treated like a temporary table or an inline view that lasts only for the
duration of the query and can be referenced various times in the same query.
--- End diff --
Thanks Dave. :)
As discussed, this paragrah will be updated to:
> The WITH clause assigns an alias to a complex expression. The alias is
treated like...
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