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JOIN ORDER BY
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Microsoft Sql Server
SELECT Statement
Natural Order
• When you do a SELECT FROM the table, the rows will ALWAYS appear in the same order of insertion
• It’s the “natural” chronologically-entered order of the rows
Data Page
• Table data is stored as a collection of 8-KB (8192-byte) pages.
• 8060 bytes for the data on each page.
• A row of data can not span multiple pages.
Pages and Extents
• The fundamental unit of data storage in SQL Server is the page.
• Size of a page is 8 KB (96-byte header )• Header store system information about the page: • Page Number• Page Type• Free pace on the page• Allocation unit ID
Data Page
Extents
• Page type: Data, Index, LOB, ROW_OVERFLOW_DATA etc.
• Extents are the basic unit in which space is managed.
• Extents are a collection of eight physically contiguous pages
JOINING OF TABLES
• INNER JOIN • LEFT OUTER JOIN • RIGHT OUTER JOIN • FULL OUTER JOIN
INNER JOIN
LEFT OUTER JOIN
RIGHT OUTER JOIN
FULL OUTER JOIN
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