It seems to be well explained and easy to understand.

shpark11249052

'Complete Mastery of Practical SQL in 49 Sessions I - Basic Course' contains essential content that you must know for SQL. By learning using a practical database, 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. For intuitive understanding, practice is conducted using a database written in Korean.

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Complete Mastery of Practical SQL in 49 Sessions I - Basic Course (Including Practice Materials and Problem Solving)

입문

초급

중급이상

Microsoft SQL Server

MSSQL

SQL-Server Installation and Practice Environment Setup, External Data Loading, SELECT Statement Basic Syntax

Single Row Function

Aggregate function

Join

Data Manipulation Language and Data Definition Language