display your age in months?

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Is there a pl/sql pragma similar to deterministic, but for the scope of one single sql select?

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What is bind reference and how can it be created?

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What is mutating table error?

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What is data modelling in sql?

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How many aggregate functions are available there in sql?

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What happens if a procedure that updates a column of table X is called in a database trigger of the same table ?

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what is the difference between implicit and explicit trigger

2 Answers   Tech Mahindra,

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What is primary and foreign key?

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How do I audit the sql sent to the server?

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How delete a row in sql?

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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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