What is a mutating table

5 Answers   TCS, Tech Mahindra,

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What is set serveroutput on?

0 Answers  

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Can we rollback truncate?

0 Answers  

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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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What is trigger and types?

0 Answers  

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Explain the PL/SQL compilation process.

3 Answers  

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Is null operator in sql?

0 Answers  

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Explain exception handling in pl/sql?

0 Answers  

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A table was given with 3 columns like Manager id,Manager Name and Employee name. Question was to create hierarchy.

2 Answers   TCS,

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Which sql statement is used to delete data from a database?

0 Answers  

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what is HASH join?

2 Answers   Genpact, HCL,

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Write a sql select query that only returns each name only once from a table?

0 Answers  

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