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How to create a Unique Indix?
Posted By :
Syed Shakeer Hussain
Posted Date :
November 28, 2009
Create UNIQUE INDEX Index_Name
You can also find related Interview Question to
How to create a Unique Indix?
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.
How you will create a UNIQUE Constraint when the table is already created?
ALTER TABLE table_name
ADD UNIQUE (Column_Name)
You work for a bank that uses a SQL Server 2005 database to store line items from customer banking transactions. The bank processes 50,000 transactions every day. The application requires a clustered index on the TransactionID column. You need to create a
table that supports an efficient reporting solution that queries the transactions by date.What are the two ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
A. Place a nonclustered index on the date column.
B. Add a unique clustered index on the date column
C. Map each partition to a filegroup, with each filegroup accessing a different physical
D. Create a partitioning scheme that partitions the data by date.
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.
Which index option causes SQL Server to create an index with empty space on
the leaf level of the index?
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.
What do you need to specify to create a linked server?
OLE DB Data Source
To create a string literal exclude escape sequence
@string. With adding @ at the beginning you can escape literal
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
What command is used to create a table by copying the structure of another table?
CREATE TABLE .. AS SELECT command
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.
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.
How u can create XML file?
To write Dataset Contents out to disk as an XML file use:
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.
You cannot create an Index on a column of the following data type
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