oracle - How to categorize several columns in one statement in SQL/PLSQL -

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i've got table 20 columns categorize like;

0-25 --> 1 25-50 --> 2 50-75 --> 3 75-100 --> 4

i prefer not use 20 case ... when statements. knows how more dynamically & efficiently? can sql or pl/sql.

i tried pl/sql, didn't see simple method use column names variables.

many thanks.

frans

your example bit confusing, assuming want put value categories, function width_bucket might after:

something this:

with sample_data (    select trunc(dbms_random.value(1,100)) val    dual    connect level < 10 ) select val, width_bucket(val, 0, 100, 4) category sample_data;

this assign numbers 1-4 (random) values sample_data. 0, 100 defines range build buckets, , final parameter 4 says in how many (equally wide) buckets should distributed. result of function bucket value val fall.

sqlfiddle example: http://sqlfiddle.com/#!4/d41d8/10721


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