update tablename set s_role = ''
alter table tablename modify column s_role int(11)
updatetablenamesets_role=''altertabletablenamemodifycolumns_roleint(11)转载于:https://www.cnblogs.com/zhaomeizi/p/10071392.html
update tablename set s_role = ''
alter table tablename modify column s_role int(11)
转载于:https://www.cnblogs.com/zhaomeizi/p/10071392.html
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