某个字段值前面增加:邮掌柜ID:
update mlos_am_member a set a.memo4=''邮掌柜ID:'||a.memo4 where memberid='M0000277100100112'
某个字段值去掉:邮掌柜ID:
UPDATE mlos_am_member SET memo4 = REPLACE(memo4, '邮掌柜ID:','')
WHERE memberid='M0000277100100112'