Can I use… case … when <op> … (extended)

The simple form of case uses an implied equals to (=) comparison. With the extended form, the comparison operator can be specified explicitly.

SELECT CASE column_name WHEN < 0 THEN 'negative'
                        WHEN = 0 THEN 'zeor'
                                 ELSE 'positive'
  FROM …

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Normative References

The extended case expression is defined in ISO/IEC 9075:2016-2 as optional feature F262.

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