Pivot Table Omitting Rows that Have Null values - mysql

Question

I am solving a problem very similar to this only in my case, I am not summing any values.
I have been able to write a select that works using solution from this page
SELECT
id,
GROUP_CONCAT(if(colID = 1, value, NULL)) AS 'First Name',
GROUP_CONCAT(if(colID = 2, value, NULL)) AS 'Last Name',
GROUP_CONCAT(if(colID = 3, value, NULL)) AS 'Job Title'
FROM tbl
GROUP BY id;
However, I want to omit rows that have the value to be null

Answer 1

I assume you want to drop the result row if any of the source rows has value IS NULL.
You should be able to achieve that with bit_and() in the HAVING clause:
SELECT id
, max(CASE WHEN colID = 1 THEN value END) AS fn
, max(CASE WHEN colID = 2 THEN value END) AS ln
, max(CASE WHEN colID = 3 THEN value END) AS jt
FROM tbl
GROUP BY id
HAVING bit_and(value IS NOT NULL);
Alternative:
...
HAVING count(*) = count(value);
I didn't spell out ELSE NULL in the CASE statements because (per documentation):
If there was no matching result value, the result after ELSE is returned, or NULL if there is no ELSE part.

Answer 2

Just add this constraint to the where statement of your query, like this:
SELECT
id,
GROUP_CONCAT(if(colID = 1, value, NULL)) AS 'First Name',
GROUP_CONCAT(if(colID = 2, value, NULL)) AS 'Last Name',
GROUP_CONCAT(if(colID = 3, value, NULL)) AS 'Job Title'
FROM tbl
WHERE value IS NOT NULL
GROUP BY id;
EDIT
After some tests I could make a solution to work, but it seems interesting why value is not null won't work.
Solution link: http://sqlfiddle.com/#!2/b7a445/3
SELECT
id,
max(case when colID = 1 then value else '' end) AS fn,
max(case when colID = 2 then value else '' end) AS ln,
max(case when colID = 3 then value else '' end) AS jt
FROM tbl
where not exists (select * from tbl b where tbl.id=b.id and value is null)
group by id