How to get non null values from a row using SQL?

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I have a table with following data in the table.
cola,colb,colc
1, NULL, NULL
NULL, 1, NULL
NULL, NULL, 1

I need output like below

1,1,1

What I have tried:

select coalesce(colun)

I would appreciate if any one helps me to get desired output. which function would help on this.

Posted 4-Jul-17 0:29am

Member 11337367

Updated 4-Jul-17 0:46am

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Kornfeld Eliyahu Peter 4-Jul-17 6:49am

And what if your data is
NULL, NULL, NULL
NULL, 1 , NULL
NULL, NULL, NULL

???

Member 11337367 4-Jul-17 6:57am

It should work for all type os scenarios
like any column or having non null values shoud come from queries

Kornfeld Eliyahu Peter 4-Jul-17 7:52am

But according to your sample if a column has null values in every row it should not show at all in the result table!

Member 11337367 4-Jul-17 7:56am

yesh that's what I wanted, only non null values from all columns in a table

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OriginalGriff · Accepted Answer · 2017-07-04T00:45:00

One way to do it:

SQL

SELECT a.cola, b.colb, c.colc FROM MyTable a
JOIN MyTable b on b.colb IS NOT NULL
JOIN MyTable c on c.colc IS NOT NULL
WHERE a.cola IS NOT NULL

How well that scales to your actual application depends on your real table design and data, and we have no idea what that looks like.