17.10 - XMLCOMMENT Syntax - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - XML Data Type

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1140-171K
Language
English (United States)
XMLCOMMENT (
  char_value_expr
  [ RETURNING { CONTENT | SEQUENCE } ]
)

Syntax Elements

char_value_expr
A character string.
The data type of char_value_expr can be CLOB, CHAR(n), or VARCHAR(n), where n is as close to 64K as permitted. If the type is CLOB, it cannot be larger than 64K.
If char_value_expr is NULL, the function returns NULL.
If the comment, derived by concatenating '<!-', the character string returned by char_value_expr, and '-->' is not a valid XML comment, an error is raised. For example, char_value_expr should not contain the substring '-->'.
RETURNING CONTENT
The return value is an XQuery document node with the comment node as its child.
RETURNING SEQUENCE
The return value is a sequence with the comment node as its only item. This is the default.