Hi All,
This is a question for those who like writing tricky queries as a single
SQL...
Assume I have a table with the following structure (imaginary table to keep
example simple):
primarykey number(8)
status char(1)
dateinserted date
<many other fields which are insignificant>
A row is inserted into this table any time one, or more, fields change for
the record. What I'm trying to determine is the "dateinserted" for each
time the value of "status" changed - remembering that there might be 50
records for the primary key and five of those include a change in status -
I want the dates of those five records (plus the value of status at each
date).
Is there any way to achieve this within a single SQL statement? I realise
that I could cursor through each record in date order and use a variable to
store the previous value of status - but I'd love to compress this to a
single statement. I've seen the syntax "OVER" used in some queries and
suspect this may be useful but I really don't understand it enough to know.
Thanks in advance if you can help me on this one,
Mark.
PS: Sorry if this appears more than once - I've been getting mail server
failures all day
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Author: Mark Richard
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