Here I keep my study notes for learning various computer languages or tools

I clear up my notes in this project(folder Linux), but i do not keep on noting in every studings.

I would note my process of learning everytime.

prefect my directory.

upload MySQL（DML）.md

upload MySQL（DQL）.md

upload MySQL（DCL）.md && MySQL（function）.md

upload MySQL（约束）.md

upload MySQL（多表查询）.md

upload MySQL（事务）.md

upload folder lanqiao

update folder lanqiao

update folder MySQL

update folder pandas,numpy,matplotlib