On Fri, Oct 01, 2010 at 08:37:07PM +0100, Andy Chambers wrote:
> Given the following....
>
> create table events (
> id,
> date,
> status
> );
> insert into events values ('001','a','N');
> insert into events values ('001','b','N');
> insert into events values ('001','c','Y');
> insert into events values ('001','d','N');
> insert into events values ('001','e','Y');
> insert into events values ('001','f','Y');
> insert into events values ('001','g','N');
>
> Is it possible, using plain SQL, to derive the following
>
> 001,c,d
> 001,e,g
It'd be easier, I think, if you had a monotonically increasing (always
by one) unique numeric column. The you could do a select for rows in
events where the value for that column is between two values which are
sub-queries for immediately preceding and following rows in the same
table and where the status differs from that of the row in the top-level
query.
Nico
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