How do I rename a constraint?
I'm only doing this because I can't change the type of a column from char(30) to
varchar(64). So I renamed to original table, but the constraints seems to be
globally unique. I don't know why, but this simple exercise of changing a column
type is getting very messy and time consuming.
What I'm trying to do now is rename the table, create a new table with the
desired column definition and then add one table from the other, then drop the
old table.