Why primary key is required?
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how to achieve this problem?i am having table with two colums like empno,gender. in gender column, i am having records male,female like that .my final output will be male female 5 6
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suppose I have two table one Emp and other is dpt. Emp table has a field ,dept id,name ,sal and dpt table has a field dept id,dept name. Now I want to find out the emplyee list whose sal is between 2000-3000 from dept x.
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