http://dev.mysql.com/doc/refman/5.5/en/cast-functions.html#function_cast

CAST(expr AS type)



[type]

BINARY[(N)]
CHAR[(N)]
DATE
DATETIME
DECIMAL[(M[,D])]
SIGNED [INTEGER]
TIME
UNSIGNED [INTEGER]



대강 이런 식으로...
SELECT CAST(FIELD_NAME AS CHAR) FROM TABLE_NAME;

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