Start Creating cursors in sql and updating each line in cursor

Creating cursors in sql and updating each line in cursor

Before I go any further: Yes, I know that cursors perform poorly compared with set-based operations.

Rather than executing a whole query at once, it is possible to set up a cursor that encapsulates the query, and then read the query result a few rows at a time.

One reason for doing this is to avoid memory overrun when the result contains a large number of rows.

As promised in the My SQL Cursors and Loops article, this article explores the use of cursors and their role in stored procedure programming.

I can make the code work by fetching to variables, but I'd like to know how to update the field directly. Address Type = '1801' update cur PO set Current POs = (select sum(Order Quantity) - sum(Receive Quantity) from #POs) drop table #POs fetch next from cur PO end close cur PO deallocate cur PO have aggregates in them that caused complications. Address Type = '1801') fetch next from cur PO end close cur PO deallocate cur PO I haven't tried this version yet, but it looks like it will have the same problem I described above.

In positional notation, all arguments are specified in order.

In named notation, each argument's name is specified using to separate it from the argument expression.

My difficulty is that I'm having trouble finding an example of how to update a column fetched by a cursor.