What is a ddl command?

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how to get help information from the server? : Sql dba

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Is sql port 1433 encrypted?

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How do you explain an index?

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In testing where do we use sql language and how it helps in testing?

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what is Complex index. how to create it?

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Is sql free?

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what's the difference between a primary key and a unique key? : 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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How does postgresql compare to oracle/db2/ms sql server/informix?

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How can I delete duplicate rows?

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What is numeric function sql?

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