What is a pdo connection?

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How can I delete duplicate rows?

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What is a Procedure ?

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What is dba in sql? : SQL DBA

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25.67,-1 Trunc = 20 Round= 30 HOW????

2 Answers   Karrox,

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Define tables and fields in a database

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How can triggers be used for the table auditing?

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What is view explain with example?

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What is an index in sql with example?

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What is a sql instance vs database?

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Name the tables where characteristics of Package, procedure and functions are stored ?

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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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