Commandline tool for running SQL queries against JSON, CSV, Excel, Parquet, and more.

This is a CLI companion to DataStation (a GUI) for running SQL queries against data files. So if you want the GUI version of this, check out DataStation.

Install

Get Go 1.17+ and then run:

$ go install github.com/multiprocessio/dsq@latest

Usage

You can either pipe data to dsq or you can pass a file name to it.

If you are passing a file, it must have the usual extension for its content type.

For example:

$ dsq testdata.json "SELECT * FROM {} WHERE x > 10"

Or:

$ dsq testdata.ndjson "SELECT name, AVG(time) FROM {} GROUP BY name ORDER BY AVG(time) DESC"

Piping data to dsq

When piping data to dsq you need to set the -s flag and specify the file extension or MIME type.

For example:

$ cat testdata.csv | dsq -s csv "SELECT * FROM {} LIMIT 1"

Or:

$ cat testdata.parquet | dsq -s parquet "SELECT COUNT(1) FROM {}"

Multiple files and joins

You can pass multiple files to DSQ. As long as they are supported data files in a valid format, you can run SQL against all files as tables. Each table can be accessed by the string {N} where N is the 0-based index of the file in the list of files passed on the commandline.

For example this joins two datasets of differing origin types (CSV and JSON).

$ dsq testdata/join/users.csv testdata/join/ages.json \
      "select {0}.name, {1}.age from {0} join {1} on {0}.id = {1}.id"

Transforming data to JSON without querying

As a shorthand for dsq testdata.csv "SELECT * FROM {}" to convert supported file types to JSON you can skip the query and the converted JSON will be dumped to stdout.

For example:

$ dsq testdata.csv
[{...some csv data...},{...some csv data...},...]

Supported Data Types

Engine

Under the hood dsq uses DataStation as a library and under that hood DataStation uses SQLite to power these kinds of SQL queries on arbitrary (structured) data.

Comparisons

The speed column is based on rough benchmarks based on q's benchmarks. Eventually I'll do a more thorough and public benchmark.

Community

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How can I help?

Download the app and use it! Report bugs on Discord.

Before starting on any new feature though, check in on Discord!

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License

This software is licensed under an Apache 2.0 license.