This site is an independent educational reference focused on data warehousing, ETL operations, and analytical system design. The archived materials preserved here reflect a period when business intelligence relied on structured extraction, transformation, and loading pipelines—and when interactive content often required a Flash Player plugin.
Key point 1. The historical excerpts above illustrate a consulting practice that emphasized trend discovery, automated reporting, and the shift from manual spreadsheet management to centralized data architectures. They also document a founder’s engineering and MBA background, along with system design responsibilities involving DBAs, programmers, and network administrators.
Key point 2. We do not claim to represent that company or any current entity. Rather, we preserve these fragments as case studies in legacy system thinking. For modern practitioners, the lessons remain relevant: understand your data flow, design for maintainability, and communicate clearly across technical roles. This archive exists to support learning, not to offer services or certifications.
When you work with Git, few commands cause as much confusion—and as many accidental rewrites—as `git rebase`. Two variants dominate everyday workflows: `git rebase --onto` and `git rebase -i` (interactive). They solve different problems, but developers often conflate them. This guide explains what each does, when to choose one over the other, and the mistakes that trip up even experienced teams.
What `git rebase --onto` Actually Does. `git rebase --onto` is a surgical transplant tool. It takes a range of commits from one branch and replays them onto a different base commit. The syntax is:
Key point 5. ```
git rebase --onto <new-base> <old-base> <branch>
```.
Here is the mental model. Suppose you have:. ```.
A - B - C - D - E (main)
\
X - Y - Z (feature)
\
P - Q (bugfix-from-feature)
```.
Key point 7. You want to move `P` and `Q` from `feature` onto `main`, but you do not want to bring `X`, `Y`, or `Z` along. Run:
Key point 8. ```
git checkout bugfix-from-feature
git rebase --onto main feature
```.
Key point 9. Git interprets this as: "Take all commits after `feature` (i.e., `P` and `Q`), and replay them on top of `main`." The result:
Key point 10
```
A - B - C - D - E (main)
\ \
X - Y - Z P' - Q' (bugfix-from-feature)
```.
Key point 11
Notice that `P'` and `Q'` are new commits with new hashes. The original `P` and `Q` still exist in the reflog until garbage collection.
The three-argument form is more explicit:
```
git rebase --onto main feature bugfix-from-feature.
```.
Key point 13
This is equivalent to checking out `bugfix-from-feature` first, then running the two-argument version. The `--onto` flag is also the standard way to remove commits from the middle of a branch without interactive editing. For example, to drop commit `C` from a linear history `A - B - C - D`, you can run:
Key point 14
```
git rebase --onto B C D
```.
Key point 15
This replays `D` (and any commits after `C`) onto `B`, effectively deleting `C`.
What Interactive Rebase (`git rebase -i`) Does.
Interactive rebase opens an editor with a list of commits in the range you are rebasing. You can reorder, squash, fixup, edit, drop, or reword each commit. The default range is `HEAD~N` or `--root` for the entire history.
The core power is rewriting commit messages and combining commits before pushing. For.
```
git rebase -i HEAD~3
```.
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