joinp
The joinp command performs a parallel join of two CSV files based on a common column.
Syntax
qsv joinp [options] <common_column> <file1> <common_column> <file2> [<output_file>]
Description
The joinp command is used to perform a parallel join of two CSV files based on a common column. This is useful for combining large datasets efficiently.
Options
-L, --left: Perform a left join-R, --right: Perform a right join-I, --inner: Perform an inner join--no-headers: When set, the first row will not be interpreted as headers
Examples
Inner Join
Perform an inner join on the transaction_id column:
qsv joinp -I transaction_id DLD_Transactions_English_500.csv transaction_id DLD_Transactions_English_500.csv | qsv table
Output:
transaction_id trans_group_en procedure_name_en instance_date property_type_en property_sub_type_en property_usage_en reg_type_en area_name_en building_name_en project_number project_name_en master_project_en nearest_landmark_en nearest_metro_en nearest_mall_en rooms_en has_parking procedure_area actual_worth meter_sale_price rent_value meter_rent_price no_of_parties_role_1 no_of_parties_role_2 no_of_parties_role_3
1-102-2022-29434 Sales Sell - Pre registration 28-09-2022 Unit Hotel Rooms Hospitality Off-Plan Properties Al Barsha South Fifth TERHAB HOTEL & TOWERS - TOWER 3 1722 TERHAB HOTEL & TOWERS AT JUMEIRAH VILLAGE TRIANGLE Jumeirah Village Triangle Sports City Swimming Academy Damac Properties Marina Mall Studio 1 34.35 555379.00 16168.24 null null 2 1 0
1-11-2024-19676 Sales Sell 31-05-2024 Flat Residential Existing Properties Marsa Dubai MARINA STAR 551 MARINA STAR Dubai Marina Sports City Swimming Academy Jumeirah Beach Residency Marina Mall 2 B/R 1 161.71 3481260.00 21527.80 null null 1 1 0
...
Left Join
Perform a left join on the transaction_id column:
qsv joinp -L transaction_id DLD_Transactions_English_500.csv transaction_id DLD_Transactions_English_500.csv | qsv table
Output:
transaction_id trans_group_en procedure_name_en instance_date property_type_en property_sub_type_en property_usage_en reg_type_en area_name_en building_name_en project_number project_name_en master_project_en nearest_landmark_en nearest_metro_en nearest_mall_en rooms_en has_parking procedure_area actual_worth meter_sale_price rent_value meter_rent_price no_of_parties_role_1 no_of_parties_role_2 no_of_parties_role_3
1-102-2022-29434 Sales Sell - Pre registration 28-09-2022 Unit Hotel Rooms Hospitality Off-Plan Properties Al Barsha South Fifth TERHAB HOTEL & TOWERS - TOWER 3 1722 TERHAB HOTEL & TOWERS AT JUMEIRAH VILLAGE TRIANGLE Jumeirah Village Triangle Sports City Swimming Academy Damac Properties Marina Mall Studio 1 34.35 555379.00 16168.24 null null 2 1 0
1-11-2024-19676 Sales Sell 31-05-2024 Flat Residential Existing Properties Marsa Dubai MARINA STAR 551 MARINA STAR Dubai Marina Sports City Swimming Academy Jumeirah Beach Residency Marina Mall 2 B/R 1 161.71 3481260.00 21527.80 null null 1 1 0
...
Right Join
Perform a right join on the transaction_id column:
qsv joinp -R transaction_id DLD_Transactions_English_500.csv transaction_id DLD_Transactions_English_500.csv | qsv table
Output:
transaction_id trans_group_en procedure_name_en instance_date property_type_en property_sub_type_en property_usage_en reg_type_en area_name_en building_name_en project_number project_name_en master_project_en nearest_landmark_en nearest_metro_en nearest_mall_en rooms_en has_parking procedure_area actual_worth meter_sale_price rent_value meter_rent_price no_of_parties_role_1 no_of_parties_role_2 no_of_parties_role_3
1-102-2022-29434 Sales Sell - Pre registration 28-09-2022 Unit Hotel Rooms Hospitality Off-Plan Properties Al Barsha South Fifth TERHAB HOTEL & TOWERS - TOWER 3 1722 TERHAB HOTEL & TOWERS AT JUMEIRAH VILLAGE TRIANGLE Jumeirah Village Triangle Sports City Swimming Academy Damac Properties Marina Mall Studio 1 34.35 555379.00 16168.24 null null 2 1 0
1-11-2024-19676 Sales Sell 31-05-2024 Flat Residential Existing Properties Marsa Dubai MARINA STAR 551 MARINA STAR Dubai Marina Sports City Swimming Academy Jumeirah Beach Residency Marina Mall 2 B/R 1 161.71 3481260.00 21527.80 null null 1 1 0
...
Common Use Cases
- Combining large datasets
- Joining data from different sources
Tips
- Verify the output to ensure the join is correctly performed
- Use in combination with other commands for complex data processing