Ошибка: 500
SELECT @groupby, COUNT(*) AS `count` FROM avc_index
WHERE activity_id IN ()
GROUP BY activity_id
ORDER BY `count` DESC
LIMIT 0, 999
OPTION max_matches = 999sphinxql: syntax error, unexpected ')', expecting CONST_INT or '-' near ')
GROUP BY activity_id
ORDER BY `count` DESC
LIMIT 0, 999
OPTION max_matches = 999'