this sql
(SELECT data FROM mezzo_chilometraggi
WHERE status <> 'E' AND id_mezzi = 4 AND data = '2011-01-01' LIMIT 1)
UNION
(SELECT data FROM mezzo_chilometraggi
WHERE status <> 'E' AND id_mezzi = 4 AND data < '2011-01-01' ORDER BY
data DESC LIMIT 1)
is not parsed correctly; the result is without parenthesis that
delimit queries before and after union
thanks in advance
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