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table name stud,a mark 23,b mark 87,c mark 75,d mark 34; write the query to find 2nd highest mark in stud table?
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Whet are the difference between primary key and foreign key?
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What are various joins used while writing SUBQUERIES?
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What are various constraints used in SQL?
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What are different Oracle database objects?
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What is a view?
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What are various privileges that a user can grant to another user?
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What is difference between UNIQUE and PRIMARY KEY constraints?
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Can a primary key contain more than one columns?
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How you will avoid duplicating records in a query?
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What is difference between SQL and SQL*PLUS?
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Which datatype is used for storing graphics and images?
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How will you delete duplicating rows from a base table?
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What is difference between SUBSTR and INSTR?
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There is a string 120000 12 0 .125 , how you will find the position of the decimal place?
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There is a % sign in one field of a column. What will be the query to find it?
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When do you use WHERE clause and when do you use HAVING clause?
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Which is more faster - IN or EXISTS?
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What is a OUTER JOIN?
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