program in sqlserver to accept only unique value

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SQL-Server-2008

i want to write a program in sqlserver storeprocedure,which will accept only unique value,if the end user insert same value for a column attribute it will raise a error,pls help me

Posted 9-Aug-13 21:05pm

amritbdk

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amritbdk 10-Aug-13 4:53am

pls explain with a eg

Maciej Los 10-Aug-13 8:39am

Not clear. Please, be more specific and provide more details.

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ArunRajendra · Answer 1 · 2013-08-09T21:46:00

This is the pseudo code.

First option
1. Check if the value already exist in the table.
2. If yes thorow the error.
3. Else to insert statement.

Second Option
1. Set the unique constraint on the field.
2. put insert statement between try catch block.
3. Catch the constraint violation exception and raise the error.

NOTE: Even in first option you need to set the unique contraint.