Amazon Redshift, a fully-managed cloud data warehouse, now supports case-insensitive collation with column and expression level overrides. Starting today, you can use the COLLATE clause within a CREATE DATABASE statement to specify the default collation for all CHAR and VARCHAR columns in the database as case-sensitive or case-insensitive. You can also specify a COLLATE clause in a CREATE TABLE statement to specify collation for columns in that table. In addition, the COLLATE() function allows you to override the collation of a string column or an expression.
Source:: Amazon AWS