Crosstab with a large or undefined number of categories

Question

My real problem has to do with recording which of a very large number of anti-virus products agree that a given sample is a member of a given anti-virus family. The databas

Answer 1

Your wish implies transfering some of the data (the names) into column headings, i.e. the schema of the resulting table. As this is somewhere between inconvenient and impossible, I would recommending just sorting and summing the data in sql, and doing the rest outside of the database.

SELECT Photo, Voter
FROM data
WHERE Decision = '...'
ORDER BY Photo, Voter

and

SELECT Photo, COUNT(*) AS Total
FROM data
WHERE Decision = '...'
GROUP BY Photo
ORDER BY Photo;