# rdbms-playground

A cross-platform terminal app for **learning relational database
concepts** — tables, columns, primary and foreign keys, relationships,
indexes, queries, and query plans — in a safe sandbox.

It's a teaching tool, not a database administration tool. It meets
beginners with guided, keyword-based commands (**simple mode**) and grows
with them to raw SQL (**advanced mode**), so the same playground works
from "what is a primary key?" through to writing real queries and reading
their execution plans.

Website & documentation: **<https://relplay.org>**

## Install

### One line (Linux / macOS)

```sh
curl -fsSL https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.sh | sh
```

Detects your OS and CPU, downloads the matching release binary, verifies
its SHA-256 checksum, and installs it to `~/.local/bin`. Set
`RDBMS_INSTALL_DIR` to install elsewhere, or `RDBMS_VERSION=vX.Y.Z` to
pin a version. (Prefer to read before you run? The script lives at
`scripts/install.sh`.)

### One line (Windows, PowerShell)

```powershell
irm https://git.lazyeval.net/oli/rdbms-playground/raw/branch/main/scripts/install.ps1 | iex
```

Downloads the matching `.exe`, verifies its checksum, installs to
`%LOCALAPPDATA%\Programs\rdbms-playground`, and adds it to your user
PATH. Or use a package manager (Scoop / winget) once those land.

### With `cargo binstall`

If you have [`cargo-binstall`](https://github.com/cargo-bins/cargo-binstall)
(install it first — it is not part of `cargo` itself):

```sh
cargo binstall rdbms-playground
```

### From source

```sh
cargo install rdbms-playground          # from crates.io
# or, from a clone:
cargo build --release                   # binary at target/release/rdbms-playground
```

### Prebuilt binaries

Every release publishes static Linux, standalone Windows, and macOS
binaries (x86_64 and aarch64) with `.sha256` checksums on the
[releases page](https://git.lazyeval.net/oli/rdbms-playground/releases).
Windows users can also use the binary directly (package-manager support
is planned).

## A quick taste

```
create table Customers with pk id(serial)
add column Customers: name (text)
add column Customers: email (text)
insert into Customers values ('Ann', 'ann@example.io')
show data Customers
```

Press **F1** while typing for a contextual hint about the command you're
building, or type `help` for the full command list. Switch to raw SQL
with `mode advanced` (or prefix a single line with `:`).

## Project status

Approaching its first public release. See the website for current
features; installation via package managers (Homebrew, Scoop, winget) is
on the roadmap.

## License

Dual-licensed under either of

- MIT license ([LICENSE-MIT](LICENSE-MIT))
- Apache License 2.0 ([LICENSE-APACHE](LICENSE-APACHE))

at your option.

## Contribution

Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual-licensed as above, without any additional terms or
conditions. See [CONTRIBUTING.md](CONTRIBUTING.md).