MYSQL. Золотой фонд запросов.

1. Как найти первый незанятый идентификатор: SELECT (mytable.id+1) as new_id FROM mytable WHERE (SELECT 1 FROM mytable as st WHERE st.id=(mytable.id+1)) IS NULL ORDER BY mytable.id LIMIT 1 то же, но начиная с 1000 SELECT (mytable.id+1) as new_id FROM mytable WHERE mytable.id>1000 AND (SELECT 1 FROM mytable as st WHERE st.id=(mytable.id+1)) IS NULL ORDER BY mytable.id LIMIT 1 2. (SELECT * ORDER BY `f1` DESC LIMIT 15) ORDER BY `f2` DESC;

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