How to set a unique key in SQL server?

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alter table tabname add UNIQUE constraint don_name on tablename(columnname);
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Related Questions

Which is a good reference book to learn SQL and database from basics?
You can learn by MS SQL Bigners book.
Harshini
I want to teach, how can I?
You can teach students Online as well as offline. If you want to teach online you need to have a communicating media.
Yasheela
How do I become master in SQL server? I am looking for real time case studies to write queries, stored procedures etc.
u can First finding for Entity Relations Db Design
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I need your help to choose my career as I have three years of gap between my education. I know SQL. Can anyone tell me should I choose MS SQL server or oracle because I am interested in the database? Which one will be better to learn to get into the IT industry? Please help me! Thank you!
As you are strong and interested in SQL, why not to choose ETL Testing? It has a good career ahead in data projects. To survive in the market, you need both Oracle & SQL Server. Actually, both are almost same but are different products.
Santhosh

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