> Just I usually prefer using fixed field lengths as queries tend to be
> significantly faster. Also, you can use them in indexes.

You are making assumptions based on other databases that are not
relevant to Postgres.

> And it leads me to wonder how you would represent an ending  "space" in a
> field,

In varchar or text fields, trailing spaces are real data.  In
fixed-width char fields, trailing spaces are pads.  AFAIK this is
consistent with the SQL92 specification.

                        regards, tom lane

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