What is the difference between clustered and non-clustered indexes?

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What is the difference between function, procedure and package in pl/sql?

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will function return more than one value how

9 Answers   Accenture,

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How many tables can a sql database have?

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What is mutating error in pl sql?

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How do you optimize a query?

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What is trigger in sql?

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What is a schema? How is it useful in sql servers?

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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;

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Explain polymorphism in pl/sql.

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What is a pl/sql block?

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How do I run a sql script?

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