Which type of cursor is used to execute the dml statement?

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What is trigger in sql?

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What is the difference between execution of triggers and stored procedures?

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How many tables can you join in sql?

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how to fetch common records from two tables? : Sql dba

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What does “select count(*) from tab” result?

15 Answers   IBM, Student, Wipro,

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what are %TYPE and %ROWTYPE? what is the difference?

7 Answers   ICICI, Saama Tech, Sail,

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can sql servers linked to other servers like oracle? : Sql dba

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what are the join types in tsql? : Transact sql

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what are the different type of sql's statements ? : Sql dba

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Explain Connect by Prior?

2 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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