data_merge_join
Documents数据横向关联工具。读取多个结构化数据文件,按指定键进行横向关联(JOIN),输出关联后的合并文件。 当用户提到数据关联、表连接、横向合并、键合并、JOIN等需求时使用此skill。 即使用户没有明确说出"关联",只要任务涉及按某个字段将多个表的数据关联在一起,就应该使用此skill。 不负责数据纵向拼接(concat)、数据去重、或字段值聚合(GROUP BY)。
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Data Merge Join 数据横向关联 Skill
功能概述
本skill用于将多个结构化数据文件按指定键进行横向关联(JOIN),支持内连接(inner)、左连接(left)、右连接(right)、全连接(outer)四种方式。多文件关联时按顺序依次进行两两关联,重名列自动添加后缀 _1、_2 以避免冲突。
文件1: 文件2: 关联结果(inner join on key):
| key | A | | key | B | | key | A | B |
|-----|---| |-----|---| |-----|---|---|
| k1 | 1 | | k1 | x | | k1 | 1 | x |
| k2 | 2 | | k3 | y |
触发条件
当用户请求以下任务时,应使用此skill:
- 数据关联/表连接
- 横向合并/键合并
- JOIN操作
- 按字段关联数据
核心参数说明
必需参数
| 参数 | 说明 |
|---|---|
--input_files | 输入文件路径列表,多个文件用逗号分隔 |
--output | 输出文件路径 |
--join_key | 关联键字段名,必须在所有输入文件中存在 |
可选参数
| 参数 | 说明 | 默认值 |
|---|---|---|
--join_how | 关联方式:inner/left/right/outer | inner |
--use_dask | 是否使用Dask处理大数据 | False |
--blocksize | Dask分块大小 | 64MB |
输入文件格式
支持 CSV、TSV、Excel(.xls/.xlsx)、SPSS(.sav)格式的结构化数据文件,每个文件必须包含关联键字段。
示例 employees.csv:
employee_id,name,department_id,salary,city
E001,Alice,SALES,8000,Beijing
E002,Bob,ENG,12000,Shanghai
示例 departments.csv:
department_id,dept_name,manager,location
SALES,Sales Department,Alice,Beijing
ENG,Engineering Department,Bob,Shanghai
使用方法
内连接(只保留两表都匹配的行)
python scripts/run_data_merge_join.py \
--input_files "file1.csv,file2.csv" \
--output merged.csv \
--join_key "id" \
--join_how inner
左连接(保留左表所有行)
python scripts/run_data_merge_join.py \
--input_files "main.csv,lookup.csv" \
--output merged.csv \
--join_key "user_id" \
--join_how left
右连接(保留右表所有行)
python scripts/run_data_merge_join.py \
--input_files "main.csv,lookup.csv" \
--output merged.csv \
--join_key "dept_id" \
--join_how right
全连接(保留两表所有行)
python scripts/run_data_merge_join.py \
--input_files "table_a.csv,table_b.csv" \
--output merged.csv \
--join_key "key" \
--join_how outer
输出示例
命令行输出:
[OK] Data merge completed!
Engine: pandas
Merge type: join
Input files: 2
Total rows before merge: 10, 5
Total rows after merge: 8
Total columns after merge: 8
Output file: merged.csv
输出CSV格式:
employee_id,name,department_id,salary,city,dept_name,manager,location
E001,Alice,SALES,8000,Beijing,Sales Department,Alice,Beijing
E002,Bob,ENG,12000,Shanghai,Engineering Department,Bob,Shanghai
环境要求
本skill依赖 pandas 及可选依赖 dask、chardet:
pip install pandas openpyxl xlrd xlwt chardet
# 可选:大数据场景
pip install dask[dataframe]
注意事项
- join_key必须在所有输入文件中存在,否则程序会报错
- 多文件关联时,按顺序依次进行两两关联
- 重名列会自动添加后缀
_1、_2等以避免冲突 - 不负责纵向拼接堆叠(concat),如需纵向合并请使用其他skill