Answer / sunita

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How many types of indexes are there in sql?

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What is the use of index in sql?

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What is memory optimized table?

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Why do we use sql constraints?

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Why use subqueries instead of joins?

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Give the structure of the procedure ?

1 Answers  

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What is a package ? What are the advantages of packages ?

2 Answers   Symphony,

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What is the difference between partition and index?

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Initially question was asked to mention the types of indexes. Then asked about BITMAP INDEX and B-Tree Index

2 Answers   Polaris,

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Write a sql to print only character form the below string. @So&*CIE%$TE@GEN!@RAL

1 Answers   Societe Generale,

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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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What are the datatypes available in pl/sql ?

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