Can we create foreign key without primary key?

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How do I access sql anywhere database?

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how do you restrict number of rows for a particular value in a column.For example:there is a table called fruits,having apples,bananas ,papayas.I dont want to have more than 100 apples in that table ,so how can u restrict number of rows for apple to hundred?

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What is database sql?

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What are data types in pl sql?

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What is trigger in flip flop?

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what will be the output: select 1 from emp union all select 2 from emp;

2 Answers   iNautix,

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what is the use of anchoring object? what r the difference between anchoring object & enclosing object? can any one tell me all the details?

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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 difference between stored procedure and trigger?

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Why we use stored procedure instead of query?

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What is the difference between unique and primary key constraints?

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