Question

The table EXPRESSION2 has data for two samples.

Table Format:

Number  ProbeID     SampleID  ExperimID  Value  Type
  1     27574       1         2          6.35   AFFE
  2     35574       1         2          3.25   AFFE

…etc

How do I find the top 100 largest differences in probe expression (value) between these two samples?

Answer 1

SELECT MAX(`Value`)-MIN(`Value`) AS `delta`
FROM `EXPRESSION2`
GROUP BY `ExperimID`
ORDER BY `delta` DESC
LIMIT 100;