Database comparison, will only simple query increase, deletion of complex subquery is not ripe, I also watched a few video in self-study nets, no actual case, the effect is not very good, how to improve a great god, please grant instruction, many thanks!

CodePudding user response:

Actual combat in actual combat

CodePudding user response:

https://blog.csdn.net/yenange/article/details/20623105

This you copied to your local do it, but it is better to get the answer to all deleted yourself again, thinking along while don't look at the answer,
Other articles, you can see,

CodePudding user response:

Combat is the hard truth,
Only by continuously in actual combat, to consolidate your grammar and logic evolution

CodePudding user response:

If you mean the SQL programming, you can see "classic example SQL" this book, there are many common example application, believe there is a big help to you,
https://item.jd.com/12396890.html