Can a formula column referred to columns in higher group ?
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Explain an index?
write a query to dispaly those name who is more than one in student table? example- in a student table sandeep kumar comes 4 times, rakesh kumar comes 2 times, ajit kumar comes 1 times so query will display sandeep kumar and rakesh kumar single times.
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What is meant by an index?
i have a table with 1 lac of data.i want to insert this data into another table. i want every 5000 of data insert use a commit.using counter and if error is comming in the 5000 of data it rollback.
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I know that i can create a table without a primary key.But is there any significance for that table???? while creating an application.
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