Hi, Ken, On Fri, Sep 18, 2020 at 2:46 PM Ken Tanzer <ken.tan...@gmail.com> wrote:
> > How to find what the primary key (or UNIQUE identifier) value is >> > for row 5 in the recordset? >> >> You're missing the point: as mentioned before, there is no "row 5". To >> update the 5th record that you've fetched, you increment a counter each >> time >> you fetch a row, and when you read #5, do an UPDATE X SET field1 = >> 'blarg' >> WHERE id = <thekeyvalue>; >> >> > It seems worth mentioning for benefit of the OPs question that there _is_ > a way to get a row number within a result set. Understanding and making > good use of that is an additional matter. > > SELECT X.field1, Y.field2*,row_number() OVER ()* from X, Y WHERE X.id = > Y.id -- ORDER BY ____? > > That row number is going to depend on the order of the query, so it might > or might not have any meaning. But if you queried with a primary key and a > row number, you could then tie the two together and make an update based on > that. > Thank you for the info. My problem is that I want to emulate Access behavior. As I said - Access does it without changing the query internally (I presume). I want to do the same with PostgreSQL. I'm just trying to understand how to make it work for any query I can have 3,4,5 tables, query them and then update the Nth record in the resulting recordset. Access does it, PowerBuilder does it. I just want to understand how. Thank you. > Cheers, > Ken > -- > AGENCY Software > A Free Software data system > By and for non-profits > *http://agency-software.org/ <http://agency-software.org/>* > *https://demo.agency-software.org/client > <https://demo.agency-software.org/client>* > ken.tan...@agency-software.org > (253) 245-3801 > > Subscribe to the mailing list > <agency-general-requ...@lists.sourceforge.net?body=subscribe> to > learn more about AGENCY or > follow the discussion. >
