Github user traflm commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/872#discussion_r91538161
--- Diff:
docs/sql_reference/src/asciidoc/_chapters/sql_functions_and_expressions.adoc ---
@@ -7523,7 +7526,139 @@ TIMESTAMPDIFF (SQL_TSI_WEEK, DATE '2006-01-01',
DATE '2006-01-09')
```
TIMESTAMPDIFF (SQL_TSI_DAY, DATE '2004-03-01', DATE '2004-02-01')
```
-
+
+<<<
+[[to_date_function]]
+== TO_DATE Function
+
+The TO_DATE function converts a character value to a date. The optional
+second argument describes the format of the character value.
+
+```
+TO_DATE(character-expression [,format-string])
+```
+
+* `_character-expression_`
++
+is an expression that gives a character value.
+
+* `_format-string_`
++
+is one of the following character string literals:
+
+** 'YYYY-MM-DD'
+** 'MM/DD/YYYY'
+** 'DD.MM.YYYY'
+** 'YYYY-MM'
+** 'MM/DD/YYYY'
+** 'YYYY/MM/DD'
+** 'YYYYMMDD'
+** 'YY/MM/DD'
+** 'MM/DD/YY'
+** 'MM-DD-YYYY'
+** 'YYYYMM'
+** 'DD-MM-YYYY'
+** 'DD-MON-YYYY'
+** 'DDMONYYYY'
--- End diff --
It will be helpful to have brief description of each of these 'marks'. what
is difference between YY and YYYY, and it must be in upper case? It will be
clear what can be valid choices for "MON" as well.
But this is not a must to have, just a suggestion.
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