SELECT * FROM `mytable` WHERE CHARACTER_LENGTH(xingming)=2SELECT CONCAT(LEFT(xingming,1),' ',RIGHT(xingming,1)) FROM `mytable` WHERE CHARACTER_LENGTH(xingming)=2UPDATE`mytable` SET xingming=CONCAT(LEFT(xingming,1),' ',RIGHT(xingming,1)) WHERE CHARACTER_LENGTH(xingming)=2
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