Joins: Difference between revisions
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== Parameters == | == Parameters == | ||
n | $m,n$: sizes of input tables | ||
== Table of Algorithms == | == Table of Algorithms == | ||
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[[File:Joins - Time.png|1000px]] | [[File:Joins - Time.png|1000px]] | ||
Latest revision as of 09:07, 28 April 2023
Description
An SQL join clause - corresponding to a join operation in relational algebra - combines columns from one or more tables in a relational database.
Parameters
$m,n$: sizes of input tables
Table of Algorithms
| Name | Year | Time | Space | Approximation Factor | Model | Reference |
|---|---|---|---|---|---|---|
| Nested loop join | 1960 | $O(nm)$ | $O({1})$ | Exact | Deterministic | |
| Sort merge join | 1960 | $O(nlogn + mlogm)$ | $O(n+m)$? | Exact | Deterministic | |
| Hash join | 1960 | $O(n+m)$ | $O(n+m)$? | Exact | Deterministic |
Time Complexity Graph
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