how to write an optimized query

i have started learning oracle,writing simple queries
i dont know how to write an optimized query.is there anyone who could help me to this.......

thanks

how to earn more money from mylot

hi friends i am new to mylot can anyone tell me how to make money through this site.......
thank u

is self study better....

i am beginner in .net platform.i am learning on net tutorials.is it better to study from a tutor or self study... can anyone sugest me which type of learning is better......

is eating fish healthy

my friends say that eating fish is not healthy
instead of eating fish,meat is more healthy.......
would u say me ur suggesion........

hi guys

whom do u think the best prime minister we have seen in INDIA.will INDIA become a super power in another 20
years.............