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You can't specify target table 'a_table' for update in from clause
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UPDATE a_table SET STATUS=0 WHERE ID=(SELECT MIN(ID) from a_table WHERE STATUS=1 AND SID=12321);
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SQL code:

UPDATE a_table a INNER JOIN
(SELECT MIN(id) mid
from a_table WHERE status=1 AND sid=12321) b
ON a.id=b.mid
SET a.status=0



UPDATE a_table A ,(SELECT MIN(ID) AS MI from a_table WHERE STATUS=1 AND SID=12321) B 
SET A.STATUS=0 
WHERE A.ID=B.MI;


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