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copied!<p>Not the most elegant I admit but it should get you what you want.</p> <p>I'm not sure how you want to handle those NULL values that have an hour average of NULL. In the example below these will get updated to -1.</p> <pre><code>create table myTable (myDate datetime not null, P_f decimal(10,5) default null ); insert into myTable(myDate,P_f) values ('2001-01-01 20:20:00',1.88); insert into myTable(myDate,P_f) values ('2001-01-01 20:25:00',NULL); insert into myTable(myDate,P_f) values ('2001-01-01 20:30:00',NULL); insert into myTable(myDate,P_f) values ('2001-01-01 20:35:00',1.71); insert into myTable(myDate,P_f) values ('2001-01-01 20:40:00',NULL); insert into myTable(myDate,P_f) values ('2001-01-01 20:45:00',NULL); insert into myTable(myDate,P_f) values ('2001-01-01 20:50:00',NULL); insert into myTable(myDate,P_f) values ('2001-01-01 20:55:00',1.835); insert into myTable(myDate,P_f) values ('2001-01-01 21:00:00',1.918); insert into myTable(myDate,P_f) values ('2001-01-01 21:05:00',1.968); insert into myTable(myDate,P_f) values ('2001-01-01 21:10:00',2.004); insert into myTable(myDate,P_f) values ('2001-01-01 21:15:00',1.924); insert into myTable(myDate,P_f) values ('2001-01-01 21:20:00',1.8625); insert into myTable(myDate,P_f) values ('2001-01-01 21:25:00',1.94); insert into myTable(myDate,P_f) values ('2001-01-01 21:30:00',2.0375); insert into myTable(myDate,P_f) values ('2001-01-01 21:35:00',1.912); insert into myTable(myDate,P_f) values ('2001-01-02 20:40:00',NULL); -- Insert copy of null value P_f rows into myTable with 1 hour average about myDate insert into myTable (myDate,P_f) select t.myDate,ifnull((select avg(P_f) from myTable t1 where t1.myDate between t.myDate - interval 1 hour and t.myDate +interval 1 hour),-1) as hourAvg from myTable t where t.P_f is null; -- delete rows where P_f is null delete from myTable where P_f is null; </code></pre>

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