I am creating an index on Emp table Empno column,if u using this indexed column in ur SELECT stmt. where clause,then how do u know that yr index will be working or nor? Thanks Advance...

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What type of database is sql?

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Name Salary Abc 50000 Abc 50000 xyz 20000 find the max salary using aggregate function?

2 Answers   CTS,

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How do you declare a variable in pl sql?

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why should required nested tables, Object types, partition tables and varying arrays. what is the difference between these are all. give me example with explanation.

2 Answers  

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what are the demerits of sql?

1 Answers  

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While inserting/updating million of records into a database table, how do I came to know how many records has been inserted or updated successfully so far?

2 Answers   HSBC,

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How to write a procedure for displying the data in a TREE or (PARENT and CHILD ) relationship , for ex: A is the main project id, for this project B,C,D are sub tasks(sub project id's) for B the sub tasks are e,f,g and for c is h ,i ,j and for d is k,l,m now i need to display the o/p in a TREE fashion pls help me , thanks in advance surendra

2 Answers   Zensar,

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find the third highest salary?

23 Answers  

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What is the difference between alter trigger and drop trigger statements?

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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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What is a parameter query?

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