Merge pull request #20 from fishtown-analytics/readme

Readme

Author: drewbanin

README.md

@@ -1,4 +1,126 @@
+<p align="center">
+  <img src="etc/dbt-logo.png" alt="dbt logo" />
+</p>
+
+----
+
 # dbt-utils
-Utility functions for dbt projects.
+This package contains macros that can be (re)used across dbt projects.
+
+## Macros
+### Cross-database
+#### current_timestamp ([source](macros/cross_db_utils/current_timestamp.sql))
+This macro returns the current timestamp.
+
+Usage:
+```
+{{ current_timestamp() }}
+```
+
+#### dateadd ([source](macros/cross_db_utils/dateadd.sql))
+This macro adds a time/day interval to the supplied date/timestamp. Note: The `datepart` argument is database-specific.
+
+Usage:
+```
+{{ dateadd(datepart='day', interval=1, from_date_or_timestamp='2017-01-01') }}
+```
+
+#### split_part ([source](macros/cross_db_utils/split_part.sql))
+This macro adds a time/day interval to the supplied date/timestamp. Note: The `datepart` argument is database-specific.
+
+Usage:
+```
+{{ split_part(string_text='1,2,3', delimiter_text=',', part_number=1) }}
+```
+---
+### Date/Time
+#### date_spine ([source](macros/datetime/date_spine.sql))
+This macro returns the sql required to build a date spine.
+
+Usage:
+```
+{{ date_spine(
+    table=ref('organizations'),
+    datepart="minute",
+    start_date="to_date('01/01/2016', 'mm/dd/yyyy')",
+    end_date="dateadd(week, 1, current_date)"
+   )
+}}
+```
+---
+### Geo
+#### haversine_distance ([source](macros/geo/haversine_distance.sql))
+This macro calculates the [haversine distance](http://daynebatten.com/2015/09/latitude-longitude-distance-sql/) between a pair of x/y coordinates.
+
+Usage:
+```
+{{ haversine_distance(lat1=<float>,lon1=<float>,lat2=<float>,lon2=<float>) }}
+```
+---
+### Schema Tests
+#### equality ([source](macros/schema_tests/equality.sql))
+This schema test asserts the equality of two relations.
+
+Usage:
+```
+model_name:
+  constraints:
+    equality:
+      - ref('other_table_name')
+
+```
+---
+### SQL helpers
+#### group_by ([source](macros/sql/groupby.sql))
+This macro build a group by statement for fields 1...N
+
+Usage:
+```
+{{ group_by(n=3) }} --> group by 1,2,3
+```
+
+#### star ([source](macros/sql/star.sql))
+This macro generates a `select` statement for each field that exists in the `from` relation. Fields listed in the `except` argument will be excluded from this list.
+
+Usage:
+```
+{{ macro star(from=ref('my_model'), except=["exclude_field_1", "exclude_field_2"]) }}
+```
+
+#### union_tables ([source](macros/sql/union.sql))
+This macro implements an "outer union." The list of tables provided to this macro will be unioned together, and any columns exclusive to a subset of these tables will be filled with `null` where not present. The `column_override` argument is used to explicitly assign the column type for a set of columns.
+
+Usage:
+```
+{{ macro union_tables(tables=[ref('table_1', 'table_2')], column_override={"some_field": "varchar(100)"}) }}
+```
+---
+### Web
+#### get_url_parameter ([source](macros/web/get_url_parameter.sql))
+This macro extracts a url parameter from a column containing a url.
+
+Usage:
+```
+{{ macro get_url_parameter(field='page_url', url_parameter='utm_source') }}
+```
+
+----
+### Getting started with dbt
+
+- [What is dbt]?
+- Read the [dbt viewpoint]
+- [Installation]
+- Join the [chat][slack-url] on Slack for live questions and support.
+
+
+## Code of Conduct
+
+Everyone interacting in the dbt project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the [PyPA Code of Conduct].
+
+
 
-### This repo is under active development and breaking changes may be readily introduced at the current time
+[PyPA Code of Conduct]: https://www.pypa.io/en/latest/code-of-conduct/
+[slack-url]: http://ac-slackin.herokuapp.com/
+[Installation]: https://dbt.readme.io/docs/installation
+[What is dbt]: https://dbt.readme.io/docs/overview
+[dbt viewpoint]: https://dbt.readme.io/docs/viewpoint