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UPDATE `unknown_mac` SET mac = CONCAT( SUBSTRING(mac, 1, 2), ':', SUBSTRING(mac, 3, 2), ':', SUBSTRING(mac, 5, 2), ':', SUBSTRING(mac, 7, 2), ':', SUBSTRING(mac, 9, 2), ':', SUBSTRING(mac, 11, 2) ) WHERE mac IS NOT NULL AND LENGTH(mac) = 12;
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UPDATE `unknown_mac` SET mac = CONCAT( SUBSTRING(mac, 1, 2), ':', SUBSTRING(mac, 3, 2), ':', SUBSTRING(mac, 5, 2), ':', SUBSTRING(mac, 7, 2), ':', SUBSTRING(mac, 9, 2), ':', SUBSTRING(mac, 11, 2) ) WHERE mac IS NOT NULL AND LENGTH(mac) = 12;
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