Write a query to find second highest salary of an employee.

27 Answers  

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I want to execute a piece of code before calling a procedure. How to achieve it?

1 Answers   Oracle,

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what is global table

7 Answers   iFlex,

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How can you maintain the integrity of your database on instances where deleting an element in a table result in the deletion of the element(s) within another table?

0 Answers  

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What are local and global Indexes and where they are useful.

0 Answers  

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What is a mutating table

5 Answers   TCS, Tech Mahindra,

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Is it important to partition hard disk?

0 Answers  

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Can you inner join the same table?

0 Answers  

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How is use pl and sql?

0 Answers  

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Explain lock escalation? : Transact sql

0 Answers  

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Hi All, I am new to both this blog and technology. I was able to see a response for one of the questions on triggers as below. I would like to know why are we using " if rtrim(to_char(sysdate,'day'))=rtrim('sunday') then" instead, can't we use " if sysdate = 'sunday' then". I can understand the use of "rtrim", but dont know y v r using to_char. I have seen this in many cases but did not get a convincible explaination. Please help me with this and do excuse if this question sounds silly. Thanks in advance...... create or replace trigger trg_sun before insert on <table name> begin if rtrim(to_char(sysdate,'day'))=rtrim('sunday') then raise_application_error(-20345,'no transaction in sunday'); end if; end trg_sun;

2 Answers  

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write a procedure to find top second no from a list of numbers

1 Answers   ABC,

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