SELECT 'stanford true', COUNT(*)
FROM documents
WHERE source_id IN (SELECT id FROM prefered_sources)
AND _stanford IS TRUE

UNION

SELECT 'analyzed true', COUNT(*)
FROM documents
WHERE source_id IN (SELECT id FROM prefered_sources)
AND _analyzed IS TRUE

UNION
SELECT 'sentences not null', COUNT(*)
FROM documents
WHERE source_id IN (SELECT id FROM prefered_sources)
AND sentences IS NOT NULL

UNION
SELECT 'termvetor not null', COUNT(*)
FROM documents
WHERE source_id IN (SELECT id FROM prefered_sources)
AND termvector IS NOT NULL

UNION
SELECT 'calaised true', COUNT(*)
FROM documents
WHERE source_id IN (SELECT id FROM prefered_sources)
AND _calaised IS TRUE