Author: <span class="vcard">Bo Andersen</span>

This article discusses how to use the ever so popular HTML5 placeholder attribute both in regards to markup syntax, but also regarding best practices. A brief discussion of the attribute’s problems also follows.

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The primary index is essential in databases. In this article, we present the main characteristics of the primary index along with its problems and solutions. A primary index physically orders the records on the secondary storage device to speed up the retrieval of data records. The index is sparse or non-dense because it only contains a block pointer for each block in the data file.

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Database Theory