How to Write Optimal SQL Queries

Question

I\'ve searched around stackoverflow but everybody asks to optimize queries they\'ve already done.

I want to know, the basic stuff on what to do, what to avoid when creat

Answer 1

I cant actually validate your claim but can say that not using * sounds quiet logical, what i can do is add a point or two to them, if you can along with giving a select columnname from tablename add a where clause it helps a lot, since you would cut down on a lot of unnecessary rows and rows of data that may be pulled up, also avoiding cross joins and welcoming inner joins, outer joins or fuller joins should be the way to go as per my personal experience :)