update TousseDefinition set tdExplain = `explain` where `explain` is not null;
update ForeignTousseApplication set ftaExplain = `explain` where `explain` is not null;
update St_material_detail set yearMonth = `year_month` where `year_month` is not null;
update St_tousse_detail set yearMonth = `year_month where `year_month` is not null;
alter table TousseDefinition drop column `explain`;
alter table ForeignTousseApplication drop column `explain`;
alter table St_material_detail drop column `year_month`;
alter table St_tousse_detail drop column `year_month`;