Select only columns without null or blank values in oracle

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How can I select only columns that don't have null value

col1 col2 col3
20    12   null
25    null     null

Desired output

col1 col2 
20    12  
25    null

What I have tried:

Not getting way to come out.......................................................

Posted 13-Jan-17 1:39am

.NET- India

Updated 13-Jan-17 2:29am

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Wendelius · Answer 1 · 2017-01-13T02:29:00

The structure of the result set is static in nature. In other words, you decide the columns when you build the query.

As far as I can see, you have few options:

1. first run a query to see which columns contain data and then run a query again with dynamically built SELECT clause containing only desired columns
2. Fetch the data into a single, XML column, handle appropriately
3. Fetch all the columns and handle formatting on client side

From those, option 3 makes most sense since SQL isn't designed for formatting, just fetching and manipulating data.