Re: CPYF = UNION ?

On 21-Oct-2014 17:38 -0500, Hoteltravelfundotcom wrote:

I have gotten the data as I need using CPYF.

Now to make this dynamic, I want to use UNION

Will this be the same as CPYF that is, if all fields are the same
lengths and # of fields are the same, we get the add perfectly.

The SQL is much more sophisticated, plus the column names are immaterial
for the UNION query; the column names from the /primary/ file are used for
the result set if they are not specified explicitly. The allowed /mapping/
and the defined /promotion/ of data types for the SQL determines if the
query is allowed [without explicit casting or other
derivations\expressions] and if so, then also what is the final data type
of each column.

Presuming [based on a prior topic that was posted about] there are two
files with identical column definitions but different column names [e.g.
name prefix betwixt, being the only differences], the UNION query is quite
simple:

select * from first_file
union all
select * from second_file

The CREATE VIEW is a tad more particular with regard to naming the
columns, so a column-list would be required:

create view union_view
( "1stField" for f1
, "2ndField" for f2
, "NthField" for fn
) as
select * from first_file
union all
select * from second_file

--
Regards, Chuck

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