>Perhaps we can change section 9.1 from "Logical Operators" to "Logical Functions and Operators"? NULLVALUE() and NONNULLVALUE() can be documented there, along with IS, IS NULL, and IS NOT NULL (which also don't seem to have been covered yet in Chapter 9).
I don't think we should document nullvalue() and nonnullvalue(), because they are not standard.
As for "not covered", IS NULL is documented in 9.2 Comparison Operators.
Ah, it's not immediately visible so I missed that. Thanks.
-- dave
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