SQL Reserved Key Words Checker Tool
I just whipped together a tool for checking for reserved sql words. The tool checks against SQL Server 2000, MySQL 5.0, PostgreSQL 8.0, Oracle 10g, ODBC, and SQL Server Future Keywords list.
It is a good idea to make sure you db schema's will work ok across multiple db platforms, so the tool will show you which platforms a word is reserved on.
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Keywords in the PostgreSQL grammar are divided into several groups, and the so-called "unreserved" keywords are actually available for use as table or column names, or in any other context as any non-keyword is. The grammar needs them as keywords because they're used in some non-ambiguous context, but for an application, there is no disinction between an unreserved keyword and a word that's not a keyword at all. For example, "CHECKPOINT" is an unreserved keyword because there's a CHECKPOINT command to perform a checkpoint, but you can create a table called CHECKPOINT or column with no problem.
An up-to-date list of keywords can be found at http://www.postgresql.org/docs/8.4/interactive/sql-keywords-appendix.html. You should ignore all the keywords listed as "non-reserved" (or blank). Even better, you could distinguish the classes of "reservedness" in the tool, but you should leave out the non-reserved ones anyway.