How do you sort in sql?

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how to enter binary numbers in sql statements? : Sql dba

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How do we accept inputs from user during runtime?

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What is a sql*loader control file?

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How to run sql functions in pl/sql?

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How can I get the number of records affected by a stored procedure?

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Which normal form is best?

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what are date and time functions in mysql? : Sql dba

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what is the difference between pragma exception_init and raise_application_error

1 Answers   Aetins, State Street,

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How many triggers can be implemented for a table?

3 Answers   HSBC,

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What is not null 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;

2 Answers  

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