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

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

SELECT CASE <Expression> WHEN < 0 THEN 'negative'
                         WHEN = 0 THEN 'zero'
                                  ELSE 'positive'
  FROM …

Normative References

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

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