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Home >> Interview Question >> Sql Server >> Post New Question Subscribe to Interview Questions

How to create a Unique Indix?

Posted By :Syed Shakeer Hussain     Posted Date :November 28, 2009    Points :10   Category :Sql Server 
Create UNIQUE INDEX Index_Name
On dbo.TABLENAME(COLUMN_NAME)

You can also find related Interview Question to How to create a Unique Indix?  below: 

Is it possible to create Cluster Index on Unique Key Column?

  
Unique key column by default creates a non-cluster index on the column. Primary key creates cluster index on the column. The only difference is Unique key column allows only one null value. So is it possible to have cluster index on Unique key column?

The answer is YES. Though Unique key allows null value but it still maintains the uniqueness of the column. (More...)

What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

  
When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

What are the requirements to create a CLR based user-defined type?

  
CLR must be enabled for the instance and A class created with a CLR-compatible language. (More...)

To create a string literal exclude escape sequence

  
@string. With adding @ at the beginning you can escape literal (More...)

What is the .NET that allows the retrieval of data by a unique key?

  
HashTable is the .NET collection class that allows the retrieval of data by a unique key (More...)

What command is used to create a table by copying the structure of another table?

  
CREATE TABLE .. AS SELECT command

Explanation :

To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
CREATE TABLE NEWTABLE AS SELECT * FROM EXISTINGTABLE WHERE 1=2;
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table. (More...)

Unique Key constraint

  
1) UNIQUE constraints are to make sure that no duplicate values are entered in specific columns that do not participate in a primary key.
2) When you are placing an unique constraint it will automatically create Unique Index to maintain the integrity.
3) Unique Allows one Null value per column where as Primary key doesn't allow null values.
4) There is no limit on having number of unqiue constraints on a table.
5) Unique Key constraint can be referenced in Foreign Key Column. (More...)

How u can create XML file?

  
To write Dataset Contents out to disk as an XML file use:
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Can I create your own custom templates in Sharepont?

  
Yes you can. You can have templates for business plans, doctor's office, lawyer's office, Educational, health etc and if you want to share with anyone else in SharePint community you can upload your own SharePoint templates to Microsoft website. (More...)

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