https://github.com/akshayxml/hash-join-and-sort-merge-join

Implementation of database relation join operators - Hash Join and Sort Merge Join
https://github.com/akshayxml/hash-join-and-sort-merge-join

database hash-join hash-join-algorithm join-tables relational-databases sort-merge-join

Last synced: 28 days ago
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Implementation of database relation join operators - Hash Join and Sort Merge Join

• Host: GitHub
• URL: https://github.com/akshayxml/hash-join-and-sort-merge-join
• Owner: akshayxml
• Created: 2021-04-24T05:59:56.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-04-24T06:14:09.000Z (over 3 years ago)
• Last Synced: 2024-04-24T14:52:45.633Z (8 months ago)
• Topics: database, hash-join, hash-join-algorithm, join-tables, relational-databases, sort-merge-join
• Language: Python
• Homepage:
• Size: 90.8 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Hash-Join-and-Sort-Merge-Join

Implementation of database relation join operators - Hash Join and Sort Merge Join

## Implementation

Given M memory blocks and two large relations R(X,Y)and S(Y,Z). There are iterators for the following operations.

- SortMerge Join

  - open()- Create sorted sublists for R and S, each of size M blocks.

  - getnext()- Use 1 block for each sublist and get minimum of R & S. Joins this minimum Y value with the other table and return. Checks for B(R)+B(S)  `

### Output file

`__join.txt` (Kindly note it contains only R & S base filename and not their path).

 

Use the generator folder to generate sample inputs.