one of the best sites for starting basics of SQL is this
https://www.w3schools.com/sql/default.asp
That being said, this forum is for MS SQLServer which is Microsofts SQL product
MySQL is a different product owned by Oracle
So if you've specific questions on MySQL you may be better off posting them in MySQL forums rather than here to get specific help as there may not be enough experts on MySQL here
Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
----------------------------
My Wiki User Page
My MSDN Page
My Personal Blog
My Facebook Page