Interesting
A newbie-ish fellow here just wrote me to say that on 11.5:
alter table <table>
add
{
col4 char(10)
};
Says "Table altered", but did not add his column.
Since curly brackets are comments - of course it didn't, but I'm surprised that he got a success message. When I try it on my (11.7) machine I get:
8200: User (informix) does not have DBSECADM authority.
Which is also a surprise.
j.