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Can you please explain me what are <br />
<br />
ROLLUP &amp;&nbsp;CUBE <br />
<br />
commands in SQL Server 2000 ? I need in simple steps in plain english so that i can understand better !! <br />
<br />
And what are the differences between <br />
<br />
COMPUTE &amp;&nbsp;COMPUTE BY when compared to ROLLUP and CUBE !!
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Can you please explain me what are 

ROLLUP & CUBE 

commands in SQL Server 2000 ? I need in simple steps in plain english so that i can understand better !! 

And what are the differences between 

COMPUTE & COMPUTE BY when compared to ROLLUP and CUBE !!

What are ROLLUP and CUBE commands in SQL Server 2000 ?

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.