I think it's great that you can see various query techniques

torch72788

'Complete Mastery of Practical SQL in 49 Sessions II - Advanced Course' follows the basic course. By using a practical database for learning, you can apply it right away in the field, and it is structured so that you can fully learn the learning content through theoretical explanations, practice, and solving a total of 200 application problems.

topdatastudio

Complete Mastery of Practical SQL in 49 Sessions II - In-depth Course (Including Practice Materials and Problem Solving)

입문

초급

중급이상

Microsoft SQL Server

MSSQL

Subquery

Window function (analysis function)

Views, user-defined procedures and functions, and triggers