# 实际查询中,如果分区不存在,DuckDB的查询会返回空结果或错误,具体取决于版本和查询 example_target_partition_path = os.path.join(partitioned_base_dir, f"stock_code={target_stock_partitioned}", f"year={target_year_partitioned}", "data.parq
python的read_csv函数有很多参数,例如: duckdb.read_csv("example.csv", header = False, sep = ",", dtype = ["int", "varchar"]) 默认不指定参数时,使用自动检测,若显式设置 delim/sep, quote, escape,或 header,则取消了参数的自动检测。 完整参数含义如下: 名称描述类型默认 all_varchar 跳过类型...
duckdb.read_parquet("example.parquet") duckdb.read_json("example.json") 1. 2. 3. 也可以使用sql语句直接读取: duckdb.sql("select * from 'data/csv/aws_locations.csv'") 1. duckdb的查询结果可以转换为各种格式: duckdb.sql("SELECT 42").fetchall() # Python原生数组对象 duckdb.sql("SELECT 42...
#!/usr/bin/env python3# -*- coding: UTF-8 -*-# ---importduckdbimportosif__name__=="__main__": csv_dir =r"/test/grade_class/example_csv"area_file_nm =r"class_grade.csv"result_file_nm =r"class_school_result.csv"area_csv_file = os.path.join(csv_dir,area_file_nm) school_...
Example.Using DuckDB in Python: Let's take a simple example of using DuckDB within a Python application. We'll create a table, populate it with sample data, and run a query. importduckdb# Connect to an in-memory DuckDB databasecon=duckdb.connect(':memory:')# Create a tablecon.execute(...
You’ll likely have to make minimal changes in your existing data pipelines, as DuckDB integrates nicely with Python’s data processing libraries. It integrates well with cloud storage platforms: For example, you can write a DuckDB SQL query that reads data directly from AWS S3. There’s no ...
│ └── example │ └── demo │ ├── DemoApplication.java │ └── controller │ └── UserController.java └── resources └── application.yml 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 配置连接 DuckDB 在application.yml文件中添加 DuckDB 的连接信息。由于 DuckDB 是嵌入式数...
[Python] Fix PyArrow filter pushdown for NaN by @Tishj in #16952Allow overriding the Printer::Print output destination by @bleskes in #16909bump out-of-tree extensions to v1.2.2 by @Tmonster in #16913Allow SQL prepared statements to be rebound by @NiclasHaderer in #16820...
Provide example code. Sep 6, 2023 LICENSE Initial commit Sep 6, 2023 README.md Update README.md Nov 1, 2023 DuckDB in Action This is the example repository for the upcomingManningbook"DuckDB in Action"which is currently in Manning Early Access Program (MEAP). ...
DuckDB also provides a convenient syntax for slicing lists, which you might find familiar if you have used list slicing in Python. SELECT film_name, list(actor_name)[2:3] AS other_actors FROM film_actors GROUP BY film_name ORDER BY film_name; One key difference from Python list indexing...