how to delete an existing column in a table? : Sql dba

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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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What is difference between hql and native sql?

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What are different categories of sql commands?

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Types of optimization?

6 Answers   Microsoft,

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How many aggregate functions are available there in sql?

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

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What is pl/sql tables?

7 Answers   TCS,

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How do I remove sql developer from windows 10?

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Define implicit and explicit cursors.

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How can we overcome recursive triggers in SQL?

1 Answers   iFlex,

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How can we make an if statement within a select statement?

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