了解 dbt 為何而生，以及如何用它建立資料轉換專案。

dbt 基礎概念

執行 dbt 指令

認識 dbt

dbt 的版本

取得說明

dbt 的使用者

建立 dbt 專案

初始化一個 dbt 專案

建立專案設定檔（profile）

歡迎使用 dbt

透過操作資料模型並在 dbt 中建立以 SQL 為基礎的模型，深入掌握 dbt 的核心。你將學習基本的 SQL 模型、定義相依關係、進行更新，並除錯各種模型問題。

操作第一個專案

dbt 專案工作流程

執行一個專案

什麼是 dbt 模型？

資料模型的特性

建立一個 dbt 模型

更新 dbt 模型

設定檔

更新一個 dbt 模型

dbt 專案與模型

學習使用 Jinja 樣板來簡化 dbt 模型，並以 `ref` 函式定義階層式相依關係，確保模型正確執行。

建立並產生 dbt 文件

dbt docs 指令選項

dbt 文件流程

dbt 文件產製流程

nyc_yellow_taxi:
  outputs:
    dev:
      type: duckdb
      path: dbt.duckdb
  target: dev



# Name your project! Project names should contain only lowercase characters
# and underscores. A good package name should reflect your organization's
# name or the intended use of these models
name: 'taxi_project'
version: '1.0.0'
config-version: 2

# This setting configures which "profile" dbt uses for this project.
profile: 'nyc_yellow_taxi'

# These configurations specify where dbt should look for different types of files.
# The `model-paths` config, for example, states that models in this project can be
# found in the "models/" directory. You probably won't need to change these!
model-paths: ["models"]
analysis-paths: ["analyses"]
test-paths: ["tests"]
seed-paths: ["seeds"]
macro-paths: ["macros"]
snapshot-paths: ["snapshots"]

target-path: "target"  # directory which will store compiled SQL files
clean-targets:         # directories to be removed by `dbt clean`
  - "target"
  - "dbt_packages"


# Configuring models
# Full documentation: https://docs.getdbt.com/docs/configuring-models

# In this example config, we tell dbt to build all models in the example/
# directory as views. These settings can be overridden in the individual model
# files using the `{{ config(...) }}` macro.
models:
  nyc_yellow_taxi:
  # Config indicated by + and applies to all files under models/example/
    taxi_rides:
    +materialized: view


{{ config(materialized='view')}}


with source_data as (
    select * from read_parquet('yellow_tripdata_2023-01-partial.parquet')
)

select * from source_data


version: 2

models:
  - name: taxi_rides_raw
    description: ____
    access: public


Run the following commands in the terminal:

dbt docs generate
dbt docs serve

version: 2

models:
  - name: taxi_rides_raw
    description: Initial import of the NYC Yellow Taxi trip data from Parquet source
    access: public


建立 dbt 文件

Jinja 範本

Jinja 可以做什麼？


# Name your project! Project names should contain only lowercase characters
# and underscores. A good package name should reflect your organization's
# name or the intended use of these models
name: 'nyc_yellow_taxi'
version: '1.0.0'
config-version: 2

# This setting configures which "profile" dbt uses for this project.
profile: 'nyc_yellow_taxi'

# These configurations specify where dbt should look for different types of files.
# The `model-paths` config, for example, states that models in this project can be
# found in the "models/" directory. You probably won't need to change these!
model-paths: ["models"]
analysis-paths: ["analyses"]
test-paths: ["tests"]
seed-paths: ["seeds"]
macro-paths: ["macros"]
snapshot-paths: ["snapshots"]

target-path: "target"  # directory which will store compiled SQL files
clean-targets:         # directories to be removed by `dbt clean`
  - "target"
  - "dbt_packages"


# Configuring models
# Full documentation: https://docs.getdbt.com/docs/configuring-models

# In this example config, we tell dbt to build all models in the example/
# directory as views. These settings can be overridden in the individual model
# files using the `{{ config(...) }}` macro.
#models:
#  nyc_yellow_taxi:
#  # Config indicated by + and applies to all files under models/example/
#    taxi_rides:
#    +materialized: view
    



select * from 'yellow_tripdata_2023-01-partial.parquet'



select
{% for column_name in ['fare_amount', 'tip_amount', 'tolls_amount', 'total_amount'] %}
  {{column_name}}{% if not loop.last %},{% endif %}
{% endfor %}
from taxi_rides_raw
   

Run the following commands in the terminal:
  
  dbt run
  

處理一個 Jinja 範本

dbt 中的階層式模型

模型建立順序

階層式模型建立


-- Update SQL to use Jinja reference
select 
   date_part('day', tpep_pickup_datetime) as day,
   count(*) as total_riders
-- Update the line below to use a Jinja function
from taxi_rides_raw
where payment_type = 1
group by day


#!/usr/bin/env python3
import duckdb
con = duckdb.connect('dbt.duckdb', read_only=True)
print(con.sql('select * from creditcard_riders_by_day'))
if (con.execute('select * from creditcard_riders_by_day').fetchall()[0][1] == 54743):
  with open('/home/repl/workspace/successful_data_check', 'w') as f:
    f.write('54743')
    


Run the following commands in the terminal:
dbt run
dbt run -f



# Name your project! Project names should contain only lowercase characters
# and underscores. A good package name should reflect your organization's
# name or the intended use of these models
name: 'nyc_yellow_taxi'
version: '1.0.0'
config-version: 2

# This setting configures which "profile" dbt uses for this project.
profile: 'nyc_yellow_taxi'

# These configurations specify where dbt should look for different types of files.
# The `model-paths` config, for example, states that models in this project can be
# found in the "models/" directory. You probably won't need to change these!
model-paths: ["models"]
analysis-paths: ["analyses"]
test-paths: ["tests"]
seed-paths: ["seeds"]
macro-paths: ["macros"]
snapshot-paths: ["snapshots"]

target-path: "target"  # directory which will store compiled SQL files
clean-targets:         # directories to be removed by `dbt clean`
  - "target"
  - "dbt_packages"


# Configuring models
# Full documentation: https://docs.getdbt.com/docs/configuring-models

# In this example config, we tell dbt to build all models in the example/
# directory as views. These settings can be overridden in the individual model
# files using the `{{ config(...) }}` macro.
models:
  nyc_yellow_taxi:
  # Config indicated by + and applies to all files under models/example/
    taxi_rides:
    +materialized: view



-- Update SQL to use Jinja reference
select 
   date_part('day', tpep_pickup_datetime) as day,
   count(*) as total_riders
-- Update the line below to use a Jinja function
from {{ ref('taxi_rides_raw') }}
where payment_type = 1
group by day


更新模型階層

dbt 入門

動手互動練習