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[](https://github.com/harelba/q/actions?query=branch%3Amaster)
# q - Text as Data
q's purpose is to bring SQL expressive power to the Linux command line and to provide easy access to text as actual data.
q allows the following:
* Performing SQL-like statements directly on tabular text data, auto-caching the data in order to accelerate additional querying on the same file.
* Performing SQL statements directly on multi-file sqlite3 databases, without having to merge them or load them into memory
The following table shows the impact of using caching:
| Rows | Columns | File Size | Query time without caching | Query time with caching | Speed Improvement |
|:---------:|:-------:|:---------:|:--------------------------:|:-----------------------:|:-----------------:|
| 5,000,000 | 100 | 4.8GB | 4 minutes, 47 seconds | 1.92 seconds | x149 |
| 1,000,000 | 100 | 983MB | 50.9 seconds | 0.461 seconds | x110 |
| 1,000,000 | 50 | 477MB | 27.1 seconds | 0.272 seconds | x99 |
| 100,000 | 100 | 99MB | 5.2 seconds | 0.141 seconds | x36 |
| 100,000 | 50 | 48MB | 2.7 seconds | 0.105 seconds | x25 |
Notice that for the current version, caching is **not enabled** by default, since the caches take disk space. Use `-C readwrite` or `-C read` to enable it for a query, or add `caching_mode` to `.qrc` to set a new default.
q's web site is [http://harelba.github.io/q/](http://harelba.github.io/q/) or [https://q.textasdata.wiki](https://q.textasdata.wiki) It contains everything you need to download and use q immediately.
## Usage Examples
q treats ordinary files as database tables, and supports all SQL constructs, such as `WHERE`, `GROUP BY`, `JOIN`s, etc. It supports automatic column name and type detection, and provides full support for multiple character encodings.
Here are some example commands to get the idea:
```bash
$ q "SELECT COUNT(*) FROM ./clicks_file.csv WHERE c3 > 32.3"
$ ps -ef | q -H "SELECT UID, COUNT(*) cnt FROM - GROUP BY UID ORDER BY cnt DESC LIMIT 3"
$ q "select count(*) from some_db.sqlite3:::albums a left join another_db.sqlite3:::tracks t on (a.album_id = t.album_id)"
```
Detailed examples are in [here](http://harelba.github.io/q/#examples)
## Installation.
**New Major Version `3.1.5` is out with a lot of significant additions.**
Instructions for all OSs are [here](http://harelba.github.io/q/#installation).
The previous version `2.0.19` Can still be downloaded from [here](https://github.com/harelba/q/releases/tag/2.0.19)
## Contact
Any feedback/suggestions/complaints regarding this tool would be much appreciated. Contributions are most welcome as well, of course.
Linkedin: [Harel Ben Attia](https://www.linkedin.com/in/harelba/)
Twitter [@harelba](https://twitter.com/harelba)
Email [harelba@gmail.com](mailto:harelba@gmail.com)
q on twitter: [#qtextasdata](https://twitter.com/hashtag/qtextasdata?src=hashtag_click)
Patreon: [harelba](https://www.patreon.com/harelba) - All the money received is donated to the [Center for the Prevention and Treatment of Domestic Violence](https://www.gov.il/he/departments/bureaus/molsa-almab-ramla) in my hometown - Ramla, Israel.
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