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- $sql = "SELECT (posledni.rychlost - predposledni.rychlost) FROM (\n"
- . " SELECT * FROM `data` ORDER BY `index` DESC LIMIT 1\n"
- . " ) AS posledni\n"
- . " JOIN (\n"
- . " SELECT * FROM `data` ORDER BY `index` DESC LIMIT 1,1\n"
- . " ) AS predposledni\n"
- . " ";
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