From all threads you open I have the distinct impression that you want our members to do you (school) home work for you.
Also, when your questions are answered, you never, ever, acknowledge that you have the solution or that you have been helped. You also never answer questions by our members about specifics of your questions.
All answers can be found in the standard documentation, available to everyone. See MySQL 5.0 Reference Manual
Ya i saw but it's ok for theoretically or may be i could not the point because my English level....so that am posted this.... any way i try once to get the point..
I need simple definition with simple example so that am understand as in beginner level....
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