What is the difference between varchar and varchar types?

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i want to join two queries....and i want to run them as one after another that is want output of first query then second , then again output of first query then second and so on...

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What is not null constraint?

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Mention the different types of replication in sql server.

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explain different types of joins? : Sql server database administration

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Can you please differentiate between a primary key and a unique key?

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Find 2nd Highest salery in emp table Select* from emp where &n= select * count from emp where (salery >=emp.salery) Enter n value 2 These query is correct or not. Tell me any other methods.

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What is primary key, unique key, and foreign key?

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Explain about thread and memory management process of SQL?

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Explain temporary table vs table variable by using cursor alternative?

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What is dbcc? Give few examples.

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What happens if you delete a table that is used by a view?

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