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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

The TABLESAMPLE Clause

The TABLESAMPLE clause lets you query a random sample of data from a table (either an exact number of rows or a percentage of rows). You can use TABLESAMPLE to quickly return a sample from a large table when the sample does not have to be a truly random sample at the level of individual rows. This clause is also useful when you want to test your code against a random subset of data that you copy from a production environment or when you just want to test the validity of your solutions against a subset of data as opposed to the entire data set.

To return a random sample of data using the TABLESAMPLE clause, you specify it in a query’s FROM clause, right after the table name or table alias. The TABLESAMPLE clause has the ...

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Publisher Resources

ISBN: 9780768696585Purchase book