Roadmap to learn SQL in 20 Days
 

First 5 Days:
Select - Where - Functions- Alies - Like

Next 5 Days:
Order by-Group by- Create - Drop - Truncate - Limit

Next 5 Days:
Join - Union All - Alter - Add - Update - Insert Into

Next 5 Days:
With - Subquery - Case - Operators - Procedures - Exists