boris/G4G0-1
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

vault backup: 2024-01-21 00:34:10

Browse Source
This commit is contained in:
George Wilkinson
2024-01-21 00:34:10 +00:00
parent 7a6e5c1b31
commit 65ac667d88
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
Semester 2/Database Systems/Week 1/Week 1 Database Systems.md
View File

@@ -34,4 +34,4 @@ Purpose is to transform a query written in a high level language into correct an
- Move SELECT operations down the tree
- Apply more restrictive SELECT operations first ( eg. equalities before range queries )
- Replace Cartesian products followed by selection with theta joins ( eg. *sigma(f) ( RxS )* -> *R theta(f) S* )
- Move PROJECT operations down the query tree ( add project operations as inputs to theta joins )
- Move PROJECT operations down the query tree ( add project operations as inputs to theta joins ).