Does a primary key have to be a number?

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Why we use triggers in mysql?

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What is a behavioral trigger?

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what is the difference between primary key and unique key? : Sql dba

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How to find string or key value using pl/sql code?

2 Answers   Ramco,

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what are the drivers in mysql? : Sql dba

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How do I pipe the output of one isql to another?

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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 difference between cursor and trigger?

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What are the two different parts of the pl/sql packages?

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Can we enter data in a table in design view?

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how to drop an existing view in mysql? : Sql dba

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