What is composite data type in pl sql?

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What is a transaction?

5 Answers  

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Difference between SUBSTR and INSTR?

3 Answers  

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Can we use update in sql function?

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Define commit, rollback and savepoint?

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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 requirement of self-join?

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Is sql a backend?

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Whate is use of MOD function in pl/sql.

3 Answers   Oracle,

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What is the maximum number of columns in sql table?

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how to calculate expressions with sql statements? : Sql dba

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what is self join and what is the requirement of self join? : Sql dba

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