Explain what is an index?

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In a PL/SQL block,which loop type should be used in a performance point of view & Why (as both loops can do the same task) 1) open - Fetch loop 2) for loop

4 Answers   JDA,

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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 subquery? : Sql dba

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define join and explain different type of joins? : Sql dba

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what is 'mysqld'? : Sql dba

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How do I run a sql trace?

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What are indexes, and what are the different types?

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How do I view a table in sql?

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Can we join same table in sql?

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what is bcp? When is it used?

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does sql support programming? : Sql dba

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