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Ideally, the tree construction procedures in the following section would be powerful enough to do the right thing given a well-formed prefix-style expression. However, sometimes reality intrudes and you need to craft SQL directly. In these cases, it still may be a good idea to use the tree construction procedures for most of the work and tweak only the small parts that need it. This selective use of varying expression construction approaches is known prosaically as quoting.
[NOTE: docs missing for sql-pre]
[NOTE: docs missing for sql-pre?]
[NOTE: docs missing for sql-unpre]
[NOTE: docs missing for sql-quote]