MySQL ALTER命令
一、列操作1.添加列alter table one add column uname char(10);2.修改列的数据类型alter table one modify column uname char(5);3.修改列名alter table one change column uid userid int;4.删除列alter table one drop column uname;二、字段约束1.添加primary key主键alte…
2026/7/3 12:10:25