What are keys in sql?


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What is sql engine in oracle?

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Which data type doesn't allow null data type?

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What is the use of sqlerrd 3?

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What is a constraint? Tell me about its various levels.

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What is nvarchar in sql?

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Let us suppose we have a table with structure in order empno empname empdesig empcountry and now i want to re-organize the columns of this table to empno empdesig empname empcountry how can i do this with queries ? assume that table contains the data.

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Does pl/sql support create command?

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