what is the difference between primary index and secondary index?
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Difference Between Primary Index and Secondary Index A primary index is an index on a set of fields that includes the unique primary key and is guaranteed not to contain duplicates. In contrast, a secondary index is an index that is not a primary index and may have duplicates.
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KEY DIFFERENCE Primary memory is also called internal memory whereas Secondary memory is also known as a Backup memory or Auxiliary memory. ... Primary memory data is directly accessed by the processing unit whereas Secondary memory data cannot be accessed directly by the processor.
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Primary: involves the retrieval and production of raw materials, such as corn, coal, wood and iron. ... Secondary: involves the transformation of raw or intermediate materials into goods e.g. manufacturing steel into cars, or textiles into clothing. (A builder and a dressmaker would be workers in the secondary sector.)
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A Non-Unique Primary Index (NUPI) means that the values for the selected column can be non-unique. Duplicate values can exist. A Non-Unique Primary Index will almost never spread the table rows evenly. An All-AMP operation will take longer if the data is unevenly distributed.
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Primary storage refers to the main storage of the computer or main memory which is the random access memory or RAM. Secondary storage, on the other hand, refers to the external storage devices used to store data on a long-term basis.
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Primary data is data that is collected by a researcher from first-hand sources, using methods like surveys, interviews, or experiments. ... Secondary data is data gathered from studies, surveys, or experiments that have been run by other people or for other research.
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When it comes to research and inquiry, there are two types of sources: primary sources and secondary sources. Primary sources are first-hand accounts of a topic while secondary sources are any account of something that is not a primary source.
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Computer memory is categorized into primary and secondary memory. While primary memory is the main memory of the computer which is used to store data or information temporarily, whereas secondary memory refers to external storage devices that are used to store data or information permanently.
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The primary market is where securities are created, while the secondary market is where those securities are traded by investors. In the primary market, companies sell new stocks and bonds to the public for the first time, such as with an initial public offering (IPO).
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A primary key has a unique constraint attached to it - so it also has an index. A database table has one clustered index (primary), the key being the primary key - if this exists - or a computed key, and more indexes on other columns.
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Primary data is the type of data that is collected by researchers directly from main sources while secondary data is the data that has already been collected through primary sources and made readily available for researchers to use for their own research.
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Difference between Primary key and Secondary key. A primary key is a field in a table that identifies each record in a database table admitting that the primary key must contain its UNIQUE values. ... A secondary key shows the secondary value that is unique for each record.
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What is the difference between secondary and primary data? Primary is data that you collected. Secondary is data that was already collected, and is relevant to your research.
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As nouns the difference between index and bibliography is that index is an alphabetical listing of items and their location while bibliography is a section of a written work containing citations, not quotations, to all the books referenced in the work.
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But the most important difference is that primary data is factual and original whereas secondary data is just the analysis and interpretation of the primary data. While primary data is collected with an aim for getting solution to the problem at hand, secondary data is collected for other purposes.
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A unique index is just an index with a unique constraint, nothing more, nothing less. A clustered index orders the data phsyically on the disk to match the index. It is useful if you access the data in the table very often via just one column, e.g. via the primary key.
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While an index is a structure that is stored in database, keys are strictly a logical concept. Index help us in fast accessing a record, whereas keys just identify the records uniquely. Every table will necessarily have a key, but having an index is not mandatory.