Comments on: Tag Cloud analysis in SQL and PL/SQL – Using Collections, Table Operator, Multiset and Collect operator

By: Anton Scheffer

Anton Scheffer — Sun, 15 Mar 2009 21:48:06 +0000

There are more useful collection conditions. For instance where you use
select ename
from emp
where 0 = ( select count(*)
from table(tags_tbl_type(‘discount’,'sales’) MULTISET EXCEPT csv_string( emp.tags) ));
you can also use
select ename
from emp
where tags_tbl_type(‘discount’,'sales’) submultiset csv_string( emp.tags);
And there’s also the cardinality function which you can use instead of “select count(*) from table( …. )

By: Lucas Jellema

Lucas Jellema — Sat, 07 Mar 2009 07:14:18 +0000

Anton,
Thanks! That member of had escaped my notice. That is quite useful. You are right that the first query is much more compact too.

groeten, Lucas

By: Anton Scheffer

Anton Scheffer — Fri, 06 Mar 2009 20:00:23 +0000

I have some more tag queries, to make your queries a little shorter

select column_value, count(*)
from emp
, table( csv_string( emp.tags ) )
group by column_value
order by 2;

select ename
from emp
where ‘discount’ member of csv_string( emp.tags );