February 08, 2008

LOV with splitted data

I found an easy technique to visualize data in lov's like this:



Use multiple UNION ALL's to concatenate the data :


select '---new colleagues---' ename, NULL job, NULL hiredate
from dual
UNION ALL
select ename, job, to_char (hiredate, 'DD.MM.YYYY')
from emp where hiredate >= to_date ('01.07.1981', 'DD.MM.YYYY')
UNION ALL
select '---before 07/81---' ename, NULL job, NULL hiredate
from dual
UNION ALL
select ename, job, to_char (hiredate, 'DD.MM.YYYY')
from emp where hiredate < to_date ('01.07.1981', 'DD.MM.YYYY')

have fun and use it
Gerd

3 comments:

Wilfred said...

Wouldn't you have to a bit more to ensure good sorting?

Nigel said...

Gerd

You should include ORDER BY:

SELECT ename, job, hiredate
FROM (
select ...
UNION ALL
select ...
UNION ALL
select ...
)
ORDER BY hiredate

or order by ename within subquery - your choice.

And make sure you can't pick the "heading" rows.

PS I love that "new colleagues" are since 1981 - is it time for the SCOTT company to experience some staff turnover?

Regards Nigel

Gerd Volberg said...

Ok, sorting is important, I know. In case of my split-select I have to select like this:

select '---new colleagues---' ename, NULL job, NULL hiredate
from dual
UNION ALL
select ename, job, hiredate
from (sorted select with where-clause)
UNION ALL
select '---before 07/81---' ename, NULL job, NULL hiredate
from dual
UNION ALL
select ename, job, hiredate
from (sorted select with where-clause)