What are the types of Database Links ?

2 Answers  

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WHAT IS THE DIFFERENCE BETWEEN PRIMARY KEY(PK) CONSTRAINT AND UNIQUE KEY(UK) + NOT NULL(NN) CONSTRAINT ASSIGN TO A COLUMN ? INSTEAD OF ASSIGNING PK ,WE CAN ASSIGN UK + NN TO A COLUMN. WHAT ARE THE MARRITS AND DEMARITS BETWEEN THE ABOVE TWO?THE ABOVE TWO ARE SAME,THEY DON'T ALLOW DUPLICATE AS WELL AS NULL VALUES.

3 Answers  

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what is the uses of cusor

3 Answers   Perot Systems,

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Why do I get java.lang.abstractmethoderror when trying to load a blob in the db?

0 Answers  

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How to use subqueries in the from clause in oracle?

0 Answers  

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25. Display the client number and the value of the highest value order placed by that client.

2 Answers   Wipro,

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What are the uses of Database Trigger ?

0 Answers  

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How does Oracle guarantee data integrity of data changes?

0 Answers  

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How to rename an index in oracle?

0 Answers  

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What is an Oracle Instance?

0 Answers  

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How to convert the date format from dd/mm/yyyy to mm/dd/yyyy. (for eg). 22/05/2008 to 05/22/2008. when u use to_char(), it tells the month is invalid. how to resolve this problem.tel with eg.

2 Answers   AppLabs,

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Indexes in oracle ?

3 Answers   Keane India Ltd, L&T,

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