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Write a sql query to make a column as unique

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The primary key ensures that the table has no duplicate rows. In case you use two or more columns, the database system will use the combination of value in these columns for the duplication check. To remove the duplicates, the database system first sorts the result set by every column specified in the SELECT clause. It then scans the table from top to bottom to identify the duplicates that are next to each other.
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Write a sql query to make a column as unique
Write a sql query to make a column as unique
Write a sql query to make a column as unique
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How can I create a unique constraint on my column (SQL Server R2)? - Stack Overflow

Indexes are used to retrieve data from the database very fast. Note: The syntax for creating indexes varies among different databases. Therefore: Check the syntax for creating indexes in your database. Note: Updating a table with indexes takes more time than updating a table without because the indexes also need an update. So, only create indexes on columns that will be frequently searched against. Get certified by completing a course today!
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SQL - Primary Key

This command is also useful to get which column users want to see as the output table. The data retrieved is put in a result table, named the result-set. The output data is saved in a result table. This output table is also termed the result-set.
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An SQL Query is used to retrieve the required data from the database. However, there may be multiple SQL queries that yield the same results but with different levels of efficiency. An inefficient query can drain the database resources, reduce the database speed or result in a loss of service for other users. So it is very important to optimize the query to obtain the best database performance. Let us consider some sample tables to understand these different methods to optimize a query.
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