Can you select more than one partition at the same time?

Question

Thank you in advance.
What is the SQL*Plus syntax to select multiple partitions from a partitioned table?
Example: select tran_date from transaction_table (partition1, partition2, partition3);

Answer 1

I think Justin is correct and you should have statistics in place and a reasonable partition scheme so that the optimizer selects the correct partitions rather than telling it what to do. You paid a lot for partitioning after all.
There are some, possibly misguided, examples in the manuals showing how to create a view so you can delete from a single partition without specifying the partition criteria in the delete statement. This in effect turns partitioning back into DIY partitioning i.e. separate tables, union all and pretend its a single logical table using a view. But backwards.
So to do what you want you just assume the partitions are separate tables, and then use union all to glue the ones you want back together.
select * from sales partition (sales_q1_2000)
union all
select * from sales partition (sales_q1_2001)
union all
select * from sales partition (sales_q1_2003)
union all
select * from sales partition (sales_q1_2004);It probably goes without saying that as well as making the expensive version of partitioning behave like the free alternative, there is the possibility that it will perform like it as well.