How to convert pivot to unpivot in Oracle

It is believed that many inexperienced people do not know what to do about the conversion between pivot and unpivot in Oracle. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

A summary of today's answers to questions

Table:score (student number, Chinese, math, English, chemistry)

Student number Chinese mathematics English chemistry 1 pass excellent excellent fail 2 excellent pass excellent

One of the implementation methods:

Select * from (

With tt as (select * from score unpivot (cj for kc in ("Chinese", "Mathematics", "English", "Chemistry"))

Select "student number", kc

(case when cj > = 80 then 'excellent' when cj > = 60 then 'pass' else 'fail' end) cj

-- decode (sign (cj-80), 0dje 'excellent', 1dje 'excellent',-1dje decode (sign (cj-60), 0pr 'pass', 1pr 'pass', 1dre 'pass', 'fail') cj

From tt)

Pivot (max (cj) for kc in ('Chinese', 'Mathematics', 'English', 'Chemistry'))

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