1.索引
【参考】https://www.cnblogs.com/sheseido/p/5825441.html
https://www.cnblogs.com/AK2012/archive/2013/01/04/2844283.html
2.回滚
select * from t_newstype
-----------------------------------
savepoint s_1;//设置一个保存点
insert into t_newstype(typename) values ('qq');
savepoint s_2;//设置保存点2
insert into t_newstype(typename) values ('ww');
rollback to savepoint s_2;//回滚到保存点2
commit;//提交
[参考]https://blog.csdn.net/weixin_38323645/article/details/82859058
https://www.cnblogs.com/youseiraws/p/8621334.html
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