If we declare constraints Unique and Not null on a single column then it will act as a Primary key, so what is the use of primary key??

3 Answers  

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What is the difference between clustered and non-clustered indexes?

0 Answers  

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How can I create a table from another table without copying any values from the old table?

8 Answers  

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How do I sort a table in sql?

0 Answers  

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What is dbo in sql?

0 Answers  

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difference between table level constraint and column level and advantages of table level constraint

4 Answers   Doyensys,

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Explain the purpose of %type and %rowtype data types with the example?

0 Answers  

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Is left join inner or outer by default?

0 Answers  

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i want count no of values in a column i.e enam eempno phoneno x 1 (98765,09887,096561,87964579,156678,678900876) that means if i select phone no from table i want to get total count of phone numbers i.e 6

8 Answers   Satyam,

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What is a null value?

0 Answers  

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what is the order of pre-defined exceptions.

6 Answers   TCS,

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What will happen after commit statement ?

2 Answers  

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