Query writing

[tensdr]

Any suggestions on best way to learn it? web or books to suggest?

[mopensoft]

I prefer online course and found Coursera is great.

[Jorgebon]

W3schools.com is a good place to start. Check it out at http://www.w3schools.com/sql/sql_intro.asp

[tgriswold]

For learning SQL basics (or MYSQL in particular), a book called the MySQL Cookbook isn't bad. Its not great for teaching you semantics but its good for syntax and a starting point for people who haven't ever used SQL.