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&nbsp;I have seen &nbsp; sql server Stored procedure example in one of tutorials &nbsp;as following <br />
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@firstname varchar(30) ='%' &nbsp; &nbsp; <br />
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&nbsp;what does it mean ?
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 I have seen   sql server Stored procedure example in one of tutorials  as following 

@firstname varchar(30) ='%'     

 what does it mean ?

sql server Stored procedure parameter

Microsoft SQL Server 2008 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. Major improvements include the  Always On technologies and support for unstructured data types.