Submitted by: Jorge Andres Brugger (jbrugger)

CREATE TABLE NEW_TABLE (NEW_FIELD VARCHAR(10) CHARACTER SET ISO8859_1 NOT NULL COLLATE ES_ES_CI_AI);
alter table NEW_TABLE add constraint PK_NEW_TABLE primary key (NEW_FIELD);

1) insert into NEW_TABLE values ('0');
2) insert into NEW_TABLE values ('?');
3) insert into NEW_TABLE values ('?');
4) insert into NEW_TABLE values ('?');

2-4: Invalid insert or update value(s): object columns are constrained - no 2 table rows can have duplicate column values.
violation of PRIMARY or UNIQUE KEY constraint "PK_NEW_TABLE" on table "NEW_TABLE".

SQL Server CI_AI and MySQL considers 0, ?, ?, ? all different values.