Explain about post-relational databases?


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Explain about normal forms?

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Where is dbms used?

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You have a table with three columns: amount1, amount2, and amount3 in a single row only one of these three columns will have a value and the other two will be null. Write a sql query to retrieve the values from these columns?

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how to find the first two highest salaries in deptno in emp table

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How can you log an error to the server event log from a stored procedure?

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In which table collections errors are stored.

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Explain about a primary key?

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There is a trigger defined for INSERT operations on a table, in an OLTP system. The trigger is written to instantiate a COM object and pass the newly insterted rows to it for some custom processing. What do you think of this implementation? Can this be implemented better?

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What is the system function to get the current user's user id?

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How can you fix a poorly performing query?

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