Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the blog post .

IS_CHAR function

Checks whether a value is a CHAR. The IS_CHAR function returns true for strings that have only ASCII characters, because the CHAR type can store only characters that are in the ASCII format. The function returns false for any other values.

Syntax

IS_CHAR(super_expression)

Arguments

Return type

BOOLEAN

Examples

To check if t is a CHAR using the IS_CHAR function, use the following example.

CREATE TABLE t(s SUPER);

INSERT INTO t VALUES ('t');

SELECT s, IS_CHAR(s) FROM t;

+-----+---------+
|  s  | is_char |
+-----+---------+
| "t" | true    |
+-----+---------+