Morning Sean,

>> What you want to do is create a single SELECT which uses the
>> UNION to create a single set of rows to be inserted into the
>> new table.

I think this should be a UNION ALL because if, for example, one of the
features for a specific ID is the same value as another feature for that
ID, then you will only get one of them. You need the union all to get
all of them.

SQL> create table x (
CON> id integer,
CON> feature integer,
CON> feature1 integer,
CON> feature2 integer);
SQL> commit;

SQL> insert into x values (1,1,1,1);
SQL> insert into x values (2,2,NULL,NULL);
SQL> commit;

SQL> select id, feature from x where feature is not null
CON> UNION
CON> select id, feature1 ........;

ID FEATURE
============ ============
1 1
2 2

Repeat with UNION ALL:

ID FEATURE
============ ============
1 1
2 2
1 1
1 1

Looks like it needs an ORDER BY on the UNION ALL as well, if we do need
the rows in ID order.


Cheers,
Norman.



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