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What is the difference between a primary key and a unique key?

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I have a table .in the table 100 recored is there .we have get the single row with out using clause..

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What company owns postgresql?

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What is the difference between SQL Constraint and PL/SQL constraint.Pls give all the constraint name.

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Is big data nosql?

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Table Order_Name has a column Order_Date which gives the date & Time at which the order is passed.Find the table to write a query to find out the latest order.

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What is a self join ?

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