IN A TABLE HAVE ONE COLUMN PRIMARY KEY..IT WILL NOT ALLOWS NULL VALUES AND DUPLICATE VALUES..INSTEAD OF PRIMARY KEY WHY CANT WE USE UNIQUE AND NOT NULL.THESE TWO ALSO DOESNT ACCEPT NULL VALUES IN NOT NULL AND UNIQUE DOESNT ACCEPT DUPLICATE VALUES? SO WHAT IS THE DIFEERENCE BETWEEN(UNIQUE,NOT NULL) AND PRIMARY KEY??????

8 Answers   rsystems,

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How can we debug in PL/SQL?

0 Answers  

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suppose we have values like 1 5 7 in a colum.Now we want numbers like(2 3 4 6) that exists between 1 5 7.How can we do this using sql query??

5 Answers   Keane India Ltd,

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differentiate between float and double. : Sql dba

0 Answers  

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i declare 4 procedure in package specification but in package body i write only 3 procedure. is it complie??//w

4 Answers   Scope International,

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What is flag in sql?

0 Answers  

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how a reference cursor works?what all adnvantages are gained with it..specify the situation?

4 Answers   TCS,

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Interchange the value of a column Gender in a table where values are Male and Female. So, where the value is Male, it should changed to Female and Female to Male.

4 Answers   Cap Gemini, IBM,

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What is an escape character in sql?

0 Answers  

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what is bcp? When is it used?

0 Answers  

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what are all the common sql function? : Sql dba

0 Answers  

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Does pdo prevent sql injection?

0 Answers  

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