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Explain the working of primary key?
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How do you get all records from 2 tables. Which join do you use?
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7 Answers ICICI, Saama Tech, Sail,
how to retrieve last tree records from table? select *from emp where rownum > (select count(*)-3 from emp); i am using this query to get last three records from table but its not giving any output, so please tell me what is the error in this query.
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i need department wise top 2 employees salary.which logic i will use
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