Github user traflm commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/837#discussion_r89670009
--- Diff:
docs/sql_reference/src/asciidoc/_chapters/sql_functions_and_expressions.adoc ---
@@ -6497,6 +6717,46 @@ Start/Date Time/Shipped (EXPR)
```
<<<
+[[sha_function]]
+== SHA Function
+
+Calculates an SHA-1 160-bit checksum for the string, as described in
+RFC 3174 (Secure Hash Algorithm). The value is returned as a string of
+40 hexadecimal digits, or NULL if the argument was NULL.
+
+[[examples_of_sha]]
+=== examples of SHA
+```
+>>SELECT SHA1('abc') from dual;
+
+(EXPR)
+-----------------------------------------
+'a9993e364706816aba3e25717850c26c9cd0d89d'
+```
+
+<<<
+[[sha2_function]]
+== SHA2 Function
+
+Calculates the SHA-2 family of hash functions (SHA-224, SHA-256, SHA-384,
+and SHA-512). The first argument is the cleartext string to be hashed.
+The second argument indicates the desired bit length of the result, which
+must have a value of 224, 256, 384, 512, or 0 (which is equivalent to
256).
--- End diff --
it is decided to not use 0, so I will modify the document here.
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