Unprintable Characters in Object Names and Literals | SHOW Statement | Vantage - 17.10 - Unprintable Characters in Object Names and Literals Returned by SHOW - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Detailed Topics

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1184-171K
Language
English (United States)

If an object name or literal returned by a SHOW request includes a character not in the repertoire of the session character set, or is otherwise unprintable, the name or literal is shown as a UNICODE delimited identifier or literal.

Each non-representable character is escaped to its hexadecimal equivalent.

The system uses BACKSLASH (U+005C), if it is available, as the escape character. If BACKSLASH is not available:
  • If either YEN SIGN (U+00A5) or WON SIGN (U+20A9) replaces BACKSLASH in the session character set, the system uses it as the escape character.
  • If none of the preceding characters is available, the system uses NUMBER SIGN (U+0023).

For example:

create table u&"#4E00" uescape'#' (i int);
show table u&"#4E00" uescape'#';

Object names that are translatable to the session character set, but are not lexically distinguishable as names are enclosed in double quotation marks.

For information on object names, see Teradata Vantage™ - SQL Fundamentals, B035-1141.

Using SHOW Output with Escape Characters in an SQL Statement

You can use SHOW output containing escape characters in another SQL statement. For example, using the SHOW output from the previous topic:

CREATE SET TABLE U&"\4E00" UESCAPE '\' ,NO FALLBACK ,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL,
     CHECKSUM = DEFAULT,
     DEFAULT MERGEBLOCKRATIO
     (
      i INTEGER)
PRIMARY INDEX ( i );