git删除所有历史提交记录,只留下最新的干净代码 1.Checkout git checkout --orphan latest_branch 2. Add all the files git add -A 3. Commit the changes git commit -am "commit message" 4. Delete the branch git branch -D master 5.Rename the current branch to master git bra
题目描述 删除emp_no重复的记录,只保留最小的id对应的记录.CREATE TABLE IF NOT EXISTS titles_test (id int(11) not null primary key,emp_no int(11) NOT NULL,title varchar(50) NOT NULL,from_date date NOT NULL,to_date date DEFAULT NULL); insert into titles_test values ('1', '1000