what is the difference between dense and sparse index?
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Dense indices are faster in general, but sparse indices require less space and impose less maintenance for insertions and deletions.
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As the array size increase, Numpy gets around 30 times faster than Python List. Because the Numpy array is densely packed in memory due to its homogeneous type, it also frees the memory faster.
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Index: It is a schema object which is used to provide improved performance in the retrieval of rows from a table. Unique Index: Unique indexes guarantee that no two rows of a table have duplicate values in the key column (or columns).
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The fast full-index scan can be performed in parallel, whereas an index-range scan or full-index scan can be processed only serially. That is, the database can allocate multiple processes to perform a fast full-index scan, but it can use only a single process for traditional index scans.
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When to use a MultiIndex: When a single column's value isn't enough to uniquely identify a row.
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The only difference between RANK, DENSE_RANK and ROW_NUMBER function is when there are duplicate values in the column being used in ORDER BY Clause. ... On the other hand, the DENSE_RANK function does not skip ranks if there is a tie between ranks. Finally, the ROW_NUMBER function has no concern with ranking.
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Index Numbers. ... In the simple index number all items of the series are treated as of equal importance. In the weighted index, weights are accorded to different items depending on their relative importance.
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asifkabirdba wrote: unique index - when we have define a column as a primary key/unique constraint then an index will be created automatically for that column. ... index - create index on the columns using "create index command" to retrieve the rows faster.
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As nouns the difference between index and appendix is that index is an alphabetical listing of items and their location while appendix is something attached to something else; an attachment or accompaniment.
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Linear search does the sequential access whereas Binary search access data randomly. Time complexity of linear search -O(n) , Binary search has time complexity O(log n).
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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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Well for one, index cards are usually heavier. They are usually 110# while cardstock is generally 80#. Additionally, index cards obviously aren't large enough to use as a card base. The index cards I have (from Staples) are 4 x 6 and are exactly the same color of white cardstock.
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When used as nouns, density means a measure of the mass of matter contained by a unit volume, whereas thickness means the property of being thick (in dimension). Density as a noun (physics): A measure of the mass of matter contained by a unit volume.
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This is the main difference between Array and Dictionary Object. An Array can have index value as numeric whereas in dictionary object, index value can be string. Hence while referring any value with key, a key can have any name associated with a value.
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The main difference between VLOOKUP and INDEX MATCH is in column reference. VLOOKUP requires a static column reference whereas INDEX MATCH requires a dynamic column reference. ... INDEX MATCH allows you to click to choose which column you want to pull the value from.
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The difference between the Point Density and Line Density tools is that the first is applied to point features and the second to linear features. ... Kernel density spreads the known quantity of the population for each point out from the point location.
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As adjectives the difference between dense and heavy is that dense is having relatively high density while heavy is (of a physical object) having great weight or heavy can be having the heaves.