On May 4, 2007, at 15:34 , Scott Ribe wrote:
Are there any other standard types that can't be cast
to varchar?
You already got an answer to the first part of your question, but I
thought you might be interested in the second as well. Here's what I
did:
SELECT DISTINCT cast_from
FROM pg_cast c
NATURAL JOIN (
SELECT oid as castsource, typname as cast_from
FROM pg_type
) s
WHERE NOT EXISTS (
SELECT 1
FROM pg_cast i
NATURAL JOIN (
SELECT oid as casttarget, typname as cast_target
FROM pg_type
) t
WHERE cast_target = 'text'
AND i.castsource = c.castsource
)
ORDER BY cast_from;
cast_from
--------------
abstime
bit
bool
box
circle
lseg
path
polygon
regclass
regoper
regoperator
regproc
regprocedure
regtype
reltime
text
varbit
(17 rows)
I don't know which of those you'd consider standard, but I believe
that's a complete list from HEAD of a few minutes ago.
Michael Glaesemann
grzm seespotcode net
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