explain access control lists. : Sql dba

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What is the diff between Truncate table / delete <table name> purge

3 Answers   TCS,

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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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Does sql profiler affect performance?

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What is query execution plan in sql?

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How to generate a salary slip like jan 1000 1000 feb 1000 2000 ... dec 1000 12000

0 Answers   BT,

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What is parameter substitution in sql?

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what is self join and why is it required? : Sql dba

1 Answers  

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What is the difference between a primary key and a unique key?

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what is the difference between trigger and constraint?

3 Answers   HSBC,

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What is the requirement of self-join?

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What is dml with example?

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