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Hello<br />
these days am studying Index in &nbsp;sql server , i read some confusing terminology !! like (high/low selectivity)<br />
can any body help me to understand wat that means? but please explin by EXAMPLes!!!!<br />
and simplify you explanation 
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Hello
these days am studying Index in  sql server , i read some confusing terminology !! like (high/low selectivity)
can any body help me to understand wat that means? but please explin by EXAMPLes!!!!
and simplify you explanation 

high selectivity concept

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.