MySQL 姓名兩個字中間加兩個空格

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