Sql server - What is Unique Index?

What is Unique Index?

- Unique index is the index that is applied to any column of a unique value.
- A unique index can also be applied to a group of columns.
- It guarantees that the index key contains no duplicate values.
- It ensures that the data integrity of the defined columns.
- It provides additional information that helps to query optimizer to produce more efficient execution plans.

ON table_name (column_name);
Sql server - Difference between clustered and non-clustered index
Both stored as B-tree structure. The leaf level of a clustered index is the actual data where as leaf level of a non-clustered index is pointer to data........
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The fill factor option is provided for smoothening index data storage and performance........
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Usually the data keeps getting added, deleted, or updated in the table due to which the fill factor is implemented during the index creation itself........
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XRumerTest 01-24-2018