how to shut down the server with 'mysqladmin'? : Sql dba

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What is normalization in sql?

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what is the difference between undefined value and null value? : Sql dba

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Difference between IN and EXISTS

4 Answers   Nous, Polaris,

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Are stored procedures faster than queries?

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How to recompile a already made trigger?

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why sql is used as interpreter frequently rather than a compile?

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Describe types of sql statements?

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how many tables will create when we create table, what are they? : Sql dba

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What are the three forms of normalization?

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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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Is it mandatory for the primary key to be given a value when a new record is inserted?

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