What is latest version of sql?

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Is sql scripting language?

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

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List the different type of joins?

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What are the most important ddl statements in sql?

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what is purge command explain about oracle performance tuning

2 Answers   Accenture, eCentric Solutions,

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what is innodb? : Sql dba

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What is nvl?

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What is a unique constraint?

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What is scalar function in sql?

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how to findout the 100th maximum salary

28 Answers   Amdocs,

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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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