Updating xml in sql server 2016
What’s more, the program allows you to import information from DBF, XML, ODF, CSV, plain text file, or other formats.
The generated data can be exported to HTML, PDF, CSV, ODF, RTF, and other formats, or saved as SQL script.
A clustered index stores the actual data rows at the leaf level of the index.
The exceptions are primarily those columns configured with large object (LOB) data types, such as image, text, and varchar(max).
You can also create indexes on XML columns, but those indexes are slightly different from the basic index and are beyond the scope of this article.
An important characteristic of the clustered index is that the indexed values are sorted in either ascending or descending order.
As a result, there can be only one clustered index on a table or view.
From there, the query engine would navigate to the leaf node for value 123.
The leaf node will contain either the entire row of data or a pointer to that row, depending on whether the index is clustered or nonclustered.
The query engine continues down through the index nodes until it reaches the leaf node.
For example, if you’re searching for the value 123 in an indexed column, the query engine would first look in the root level to determine which page to reference in the top intermediate level.
Given the fundamental importance of indexes in databases, it always comes as a surprise how often the proper design of indexes is neglected.
It often turns out that the programmer understands detail, but not the broad picture of what indexes do.
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