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copied!<p>Something like this works in SQL Server. I don't have MySQL to test but you can probably convert once you see the logic.</p> <pre><code>create table so (sodate datetime, sosize int, somarked varchar(1)) insert into so (sodate,sosize,somarked) values ('1-jan-2010',3,'X') insert into so (sodate,sosize,somarked) values ('2-jan-2010',1,'X') insert into so (sodate,sosize,somarked) values ('3-jan-2010',2,'X') insert into so (sodate,sosize,somarked) values ('4-jan-2010',0,null) insert into so (sodate,sosize,somarked) values ('5-jan-2010',2,null) insert into so (sodate,sosize,somarked) values ('6-jan-2010',1,null) insert into so (sodate,sosize,somarked) values ('6-jan-2010',4,null) insert into so (sodate,sosize,somarked) values ('6-jan-2010',1,null) insert into so (sodate,sosize,somarked) values ('7-jan-2010',3,'X') insert into so (sodate,sosize,somarked) values ('8-jan-2010',3,'X') insert into so (sodate,sosize,somarked) values ('9-jan-2010',2,null) insert into so (sodate,sosize,somarked) values ('10-jan-2010',2,'X') insert into so (sodate,sosize,somarked) values ('11-jan-2010',1,'X') insert into so (sodate,sosize,somarked) values ('12-jan-2010',2,null) insert into so (sodate,sosize,somarked) values ('13-jan-2010',3,'X') select so.sodate ,sum(so.sosize) as Total ,isnull(sum(so.sosize),0) - isnull(min(so2.sosize),0) as DiffFromYesterday ,sum(case when so.somarked = 'X' then so.sosize end) as MarkedThisDay from so left join (select so.sodate,sum(so.sosize) sosize from so group by sodate) so2 on dateadd(dd,1,so2.sodate) = so.sodate group by so.sodate </code></pre> <p>..and after installing mysql this seems to work there...</p> <pre><code>select so.sodate ,sum(so.sosize) as Total ,ifnull(sum(so.sosize),0) - ifnull(min(so2.sosize),0) as DiffFromYesterday ,sum(case when so.somarked = 'X' then so.sosize end) as MarkedThisDay from so left join (select so.sodate,sum(so.sosize) sosize from so group by sodate) so2 on (so2.sodate + INTERVAL 1 day )= so.sodate group by so.sodate ; </code></pre>

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