What is a heap in sql?

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What is null in pl/sql?

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Explain the difference between triggers and constraints?

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why we use nocopy?

2 Answers   Polaris,

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What do you mean by stored procedures?

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List the ways to get the count of records in a table?

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What information is needed to connect sql*plus an oracle server?

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How many tables can you join in sql?

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Explain isolation levels. : Transact sql

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What is sql server and ase?

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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 the sql case statement?

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