I hope the Stackoverflow post is more coherent.

So, in the end you want to

insert into table (col1) values (value1)
insert into table (col1) values (value8)
insert into table (col2) values (value2)
insert into table (col2) values (value9)
insert into table (col3) values (value3)
...
insert into table (col4) values (value14)
insert into table (col4) values (value15)
[download]

Is that correct? You want to retrieve the data from the array of hashes organized in such a way to facilitate that.